diff --git a/core/includes/install.core.inc b/core/includes/install.core.inc
index 159d729b9e..875b94967d 100644
--- a/core/includes/install.core.inc
+++ b/core/includes/install.core.inc
@@ -9,6 +9,7 @@
 use Drupal\Core\Batch\BatchBuilder;
 use Drupal\Core\Config\ConfigImporter;
 use Drupal\Core\Config\ConfigImporterException;
+use Drupal\Core\Config\Importer\ConfigImporterBatch;
 use Drupal\Core\Config\StorageComparer;
 use Drupal\Core\DrupalKernel;
 use Drupal\Core\Database\Database;
@@ -2341,13 +2342,13 @@ function install_config_import_batch() {
 
     $batch_builder = new BatchBuilder();
     $batch_builder
-      ->setFinishCallback('install_config_import_batch_finish')
+      ->setFinishCallback([ConfigImporterBatch::class, 'finish'])
       ->setTitle(t('Importing configuration'))
       ->setInitMessage(t('Starting configuration import.'))
       ->setErrorMessage(t('Configuration import has encountered an error.'));
 
     foreach ($sync_steps as $sync_step) {
-      $batch_builder->addOperation('install_config_import_batch_process', [$config_importer, $sync_step]);
+      $batch_builder->addOperation([ConfigImporterBatch::class, 'process'], [$config_importer, $sync_step]);
     }
 
     return $batch_builder->toArray();
@@ -2364,62 +2365,6 @@ function install_config_import_batch() {
   }
 }
 
-/**
- * Processes the config import batch and persists the importer.
- *
- * @param \Drupal\Core\Config\ConfigImporter $config_importer
- *   The batch config importer object to persist.
- * @param string $sync_step
- *   The synchronization step to do.
- * @param $context
- *   The batch context.
- *
- * @see install_config_import_batch()
- */
-function install_config_import_batch_process(ConfigImporter $config_importer, $sync_step, &$context) {
-  if (!isset($context['sandbox']['config_importer'])) {
-    $context['sandbox']['config_importer'] = $config_importer;
-  }
-
-  $config_importer = $context['sandbox']['config_importer'];
-  $config_importer->doSyncStep($sync_step, $context);
-  if ($errors = $config_importer->getErrors()) {
-    if (!isset($context['results']['errors'])) {
-      $context['results']['errors'] = [];
-    }
-    $context['results']['errors'] = array_merge($context['results']['errors'], $errors);
-  }
-}
-
-/**
- * Finish config importer batch.
- *
- * @see install_config_import_batch()
- */
-function install_config_import_batch_finish($success, $results, $operations) {
-  $messenger = \Drupal::messenger();
-  if ($success) {
-    if (!empty($results['errors'])) {
-      $logger = \Drupal::logger('config_sync');
-      foreach ($results['errors'] as $error) {
-        $messenger->addError($error);
-        $logger->error($error);
-      }
-      $messenger->addWarning(t('The configuration was imported with errors.'));
-    }
-  }
-  else {
-    // An error occurred.
-    // $operations contains the operations that remained unprocessed.
-    $error_operation = reset($operations);
-    $message = t('An error occurred while processing %error_operation with arguments: @arguments', [
-      '%error_operation' => $error_operation[0],
-      '@arguments' => print_r($error_operation[1], TRUE),
-    ]);
-    $messenger->addError($message);
-  }
-}
-
 /**
  * Replaces install_download_translation() during configuration installs.
  *
diff --git a/core/lib/Drupal/Core/Config/Importer/ConfigImporterBatch.php b/core/lib/Drupal/Core/Config/Importer/ConfigImporterBatch.php
new file mode 100644
index 0000000000..8aee289e0d
--- /dev/null
+++ b/core/lib/Drupal/Core/Config/Importer/ConfigImporterBatch.php
@@ -0,0 +1,77 @@
+<?php
+
+namespace Drupal\Core\Config\Importer;
+
+use Drupal\Core\Config\ConfigImporter;
+
+/**
+ * Methods for running the ConfigImporter in a batch.
+ *
+ * @see \Drupal\Core\Config\ConfigImporter
+ */
+class ConfigImporterBatch {
+
+  /**
+   * Processes the config import batch and persists the importer.
+   *
+   * @param \Drupal\Core\Config\ConfigImporter $config_importer
+   *   The batch config importer object to persist.
+   * @param string $sync_step
+   *   The synchronization step to do.
+   * @param array $context
+   *   The batch context.
+   */
+  public static function process(ConfigImporter $config_importer, $sync_step, &$context) {
+    if (!isset($context['sandbox']['config_importer'])) {
+      $context['sandbox']['config_importer'] = $config_importer;
+    }
+
+    $config_importer = $context['sandbox']['config_importer'];
+    $config_importer->doSyncStep($sync_step, $context);
+    if ($errors = $config_importer->getErrors()) {
+      if (!isset($context['results']['errors'])) {
+        $context['results']['errors'] = [];
+      }
+      $context['results']['errors'] = array_merge($errors, $context['results']['errors']);
+    }
+  }
+
+  /**
+   * Finish batch.
+   *
+   * This function is a static function to avoid serializing the ConfigSync
+   * object unnecessarily.
+   *
+   * @param bool $success
+   *   Indicate that the batch API tasks were all completed successfully.
+   * @param array $results
+   *   An array of all the results that were updated in update_do_one().
+   * @param array $operations
+   *   A list of the operations that had not been completed by the batch API.
+   */
+  public static function finish($success, $results, $operations) {
+    $messenger = \Drupal::messenger();
+    if ($success) {
+      if (!empty($results['errors'])) {
+        $logger = \Drupal::logger('config_sync');
+        foreach ($results['errors'] as $error) {
+          $messenger->addError($error);
+          $logger->error($error);
+        }
+        $messenger->addWarning(t('The configuration was imported with errors.'));
+      }
+      elseif (!drupal_installation_attempted()) {
+        // Display a success message when not installing Drupal.
+        $messenger->addStatus(t('The configuration was imported successfully.'));
+      }
+    }
+    else {
+      // An error occurred.
+      // $operations contains the operations that remained unprocessed.
+      $error_operation = reset($operations);
+      $message = t('An error occurred while processing %error_operation with arguments: @arguments', ['%error_operation' => $error_operation[0], '@arguments' => print_r($error_operation[1], TRUE)]);
+      $messenger->addError($message);
+    }
+  }
+
+}
diff --git a/core/modules/config/src/Form/ConfigSync.php b/core/modules/config/src/Form/ConfigSync.php
index 44034ddabb..57fb1d860e 100644
--- a/core/modules/config/src/Form/ConfigSync.php
+++ b/core/modules/config/src/Form/ConfigSync.php
@@ -4,6 +4,7 @@
 
 use Drupal\Core\Config\ConfigImporterException;
 use Drupal\Core\Config\ConfigImporter;
+use Drupal\Core\Config\Importer\ConfigImporterBatch;
 use Drupal\Core\Config\TypedConfigManagerInterface;
 use Drupal\Core\Extension\ModuleHandlerInterface;
 use Drupal\Core\Extension\ModuleInstallerInterface;
@@ -337,14 +338,14 @@ public function submitForm(array &$form, FormStateInterface $form_state) {
         $sync_steps = $config_importer->initialize();
         $batch = [
           'operations' => [],
-          'finished' => [get_class($this), 'finishBatch'],
+          'finished' => [ConfigImporterBatch::class, 'finish'],
           'title' => t('Synchronizing configuration'),
           'init_message' => t('Starting configuration synchronization.'),
           'progress_message' => t('Completed step @current of @total.'),
           'error_message' => t('Configuration synchronization has encountered an error.'),
         ];
         foreach ($sync_steps as $sync_step) {
-          $batch['operations'][] = [[get_class($this), 'processBatch'], [$config_importer, $sync_step]];
+          $batch['operations'][] = [[ConfigImporterBatch::class, 'process'], [$config_importer, $sync_step]];
         }
 
         batch_set($batch);
@@ -368,20 +369,15 @@ public function submitForm(array &$form, FormStateInterface $form_state) {
    *   The synchronization step to do.
    * @param array $context
    *   The batch context.
+   *
+   * @deprecated in Drupal 8.6.0 and will be removed before 9.0.0. Use
+   *   \Drupal\Core\Config\Importer\ConfigImporterBatch::process() instead.
+   *
+   * @see https://www.drupal.org/node/2897299
    */
   public static function processBatch(ConfigImporter $config_importer, $sync_step, &$context) {
-    if (!isset($context['sandbox']['config_importer'])) {
-      $context['sandbox']['config_importer'] = $config_importer;
-    }
-
-    $config_importer = $context['sandbox']['config_importer'];
-    $config_importer->doSyncStep($sync_step, $context);
-    if ($errors = $config_importer->getErrors()) {
-      if (!isset($context['results']['errors'])) {
-        $context['results']['errors'] = [];
-      }
-      $context['results']['errors'] += $errors;
-    }
+    @trigger_error('\Drupal\config\Form\ConfigSync::processBatch() deprecated in Drupal 8.6.0 and will be removed before 9.0.0. Use \Drupal\Core\Config\Importer\ConfigImporterBatch::process() instead. See https://www.drupal.org/node/2897299');
+    ConfigImporterBatch::process($config_importer, $sync_step, $context);
   }
 
   /**
@@ -389,27 +385,15 @@ public static function processBatch(ConfigImporter $config_importer, $sync_step,
    *
    * This function is a static function to avoid serializing the ConfigSync
    * object unnecessarily.
+   *
+   * @deprecated in Drupal 8.6.0 and will be removed before 9.0.0. Use
+   *   \Drupal\Core\Config\Importer\ConfigImporterBatch::finish() instead.
+   *
+   * @see https://www.drupal.org/node/2897299
    */
   public static function finishBatch($success, $results, $operations) {
-    if ($success) {
-      if (!empty($results['errors'])) {
-        foreach ($results['errors'] as $error) {
-          \Drupal::messenger()->addError($error);
-          \Drupal::logger('config_sync')->error($error);
-        }
-        \Drupal::messenger()->addWarning(\Drupal::translation()->translate('The configuration was imported with errors.'));
-      }
-      else {
-        \Drupal::messenger()->addStatus(\Drupal::translation()->translate('The configuration was imported successfully.'));
-      }
-    }
-    else {
-      // An error occurred.
-      // $operations contains the operations that remained unprocessed.
-      $error_operation = reset($operations);
-      $message = \Drupal::translation()->translate('An error occurred while processing %error_operation with arguments: @arguments', ['%error_operation' => $error_operation[0], '@arguments' => print_r($error_operation[1], TRUE)]);
-      \Drupal::messenger()->addError($message);
-    }
+    @trigger_error('\Drupal\config\Form\ConfigSync::finishBatch() deprecated in Drupal 8.6.0 and will be removed before 9.0.0. Use \Drupal\Core\Config\Importer\ConfigImporterBatch::finish() instead. See https://www.drupal.org/node/2897299');
+    ConfigImporterBatch::finish($success, $results, $operations);
   }
 
 }