label help text show on View mode

There is no possibility to do that with Label Help.
You can implement hook_entity_view() in your custom module.

works for me:

/**
 * Implements hook_entity_view().
 */
function MODULE_entity_view($entity, $type, $view_mode, $langcode) {
  $field_name = 'body';
  $ids = entity_extract_ids($type, $entity);
  $field = field_info_instance($type, $field_name, $ids[2]);

  if (isset($field['widget']['settings']['label_help_description'])) {
    $tag = array(
      '#type' => 'html_tag',
      '#tag' => 'div',
      '#attributes' => array('class' => 'label-help'),
      '#value' =>  $field['widget']['settings']['label_help_description'],
    );

    $entity->content[$field_name]['#prefix'] = render($tag);
  }
}