re-order > How to use in WPQuery for 'orderby'?

Hi,
I have searched in the docs (https://docs.metabox.io/extensions/mb-custom-post-type) how to use the Meta Box 're-order' feature in a WPQuery.

Please can you help me what name I have to use?

?php
$query_args = [
  'post_type' => 'my-custom-post',
  'posts_per_page' => 4,
  'orderby' => '?????',
  'order' => 'ASC',
  'post_status' => 'publish'
];