set cron to delete post revisions

cron-delete-revisions.php

    add_action('rkv_revision_cron', 'rkv_revision_delete');

    // set cron schedule
    function rkv_revision_schedule() {
        if ( !wp_next_scheduled( 'rkv_revision_cron' ) ) {
            wp_schedule_event( time(), 'daily', 'rkv_revision_cron');
        }
    }
    add_action('wp', 'rkv_revision_schedule');

    // run deletion on revisions
    function rkv_revision_delete() {

        // query revisions and get array of IDs
        $args = array(
            'fields'        => 'ids',
            'post_type'     => 'revision',
            'numberposts'   => -1
        );

        $revisions = get_posts($args);

        // loop through and delete each
        foreach ($revisions as $revision):

            wp_delete_post( $revision );

        endforeach;
    }