Order categories by sum of custom fields

$terms = get_terms( array(

            'taxonomy'   => 'category',
            'hide_empty' => false,
        ) );
        $sort  = array();
        //loop to list through all category
        foreach ( $terms as $term ) {
            $id    = $term->ID;
            $name  = $term->name;
            $args  = array(
                'post_type' => 'post',
                'category'  => $name,

            );

            $query = new WP_Query( $args );
            $sum   = 0;
            if ($query->have_posts() ):while ($query->have_posts() ):$query->the_post();
                // to add all the values of the custom field

                $sum += get_post_meta( get_the_ID(), '_postviews ', true );
            endwhile;
                //adds term name and the total sum of all _postviews meta in array the term name as key abnd the sum as its value
                $sort[ $name ] = $sum;
            endif;
            //sort keys based on values HIGH TO LOW


        }
 arsort( $sort );       
 print_r( $sort );

Theoretically the above code should work as

1. It loops through your category
2. Gets post based on your category
3. Get post most meta and store add them in the variable sum
4. Once all the post have been checked and stored in a variable sum, they are now stored as array in the variable $sort

Could you please let me know if this code worked for you or not