Custom Post Type Query

I was looking for an answer to this in the threads but couldn’t find a good answer.

I have a custom post type and only that type has ratings. I went into the theme and the place that queries the list of posts and tried the following code:

<?php
    $args = array(
        'post_type' => 'reviewer',
        'posts_per_page' => -1,
         array(
             'meta_key' => 'ratings_average',
             'orderby' => 'meta_value_num',
             'order' => 'DESC'
         )
    );
    $loop = new WP_Query( $args );
    while ( $loop->have_posts() ) : $loop->the_post();
?>

That code does not work. Anyone have any workarounds?

https://wordpress.org/plugins/wp-postratings/