Custom Post Type – Support “author” only for admins

Thanks to TomJNowell‘s help, this would be a possible working solution:

$supports = array(
    'title',
    'editor'
);
if(current_user_can('delete_plugins')){
    $supports[] = 'author';
}
register_post_type('whatever',
    array(
    'labels'        => array(
                      'name'           => 'Whatever',
                      'singular_name'  => 'Whatever'
                      ),
    'supports'      => $supports,
....