Hello!
Thanks for the snippet, but it looks like it's not recommended. From https://api.drupal.org/api/drupal/core%21lib%21Drupal%21Core%21Extension%21module.api.php/function/hook_update_N/8.5.x
Never call \Drupal::entityDefinitionUpdateManager()::applyUpdates() in an update function, as it will apply updates for any module not only yours, which will lead to unpredictable results.