Return star count

Is there a way to return the average star count?

I want to add a custom class based on the number of stars each listing has. I had originally done this based on the number of comments by doing the following:

function listing_has_reviews( $classes, $class, $post_ID ) {
    global $gd_post;
    $reviewcount = get_comments_number();
 
    if($reviewcount > 0 ) {
        $classes[] = 'gd-has-1-review'; 
    }
    return $classes;
}

However, I am seeing that (for my purposes) this will not work so I instead need to return the number of stars.

Any pointers would be appreciated.

And apologies (in advance) if I have posted this in the wrong forum.