How to show posts with a meta key on the top of the query results rest after tha

I’m using WP_Query($args) to populate a search result of custom post types.

I want to sort the results based on a post meta value named offer_id.

Aim is to bring the posts with this meta key set to the top of the search results.

When I tried,

$args = .....
$args['meta_query'] = array(....);
$args['meta_query']['offers'] =
array(
    'key'=>'offer_id',
    'compare' => 'EXISTS',
);
$args['orderby']  = 'meta_value';

Only custom posts having offer_id meta value included in the results, posts without offer_is meta value are not included.

How can I show the posts with meta key offer_id on the top of the query results and posts without meta key on the bottom?