get approved users only ( ultimate member plugin )

I assume your WP settings is

  1. New User Default Role = contributor

If yes, so this block of code shows all the contributor’s with account_status = approved;

$args = array(
    'role'          =>  'contributor',
    'meta_key'      =>  'account_status',
    'meta_value'    =>  'approved'
);

$users = get_users($args);

foreach ($users as $user) {
   echo '<pre>';
   print_r( $user );
   echo '</pre>';
}

https://codex.wordpress.org/Function_Reference/get_users