Weekly Flush all caches of W3TC Automatically

<?php
/** Flush all caches of W3TC
 * Weekly basis
 */
//add weekly shcedule to wp cron
function dctit_cron_add_weekly( $schedules ) {
   //adds once weekly to the existing schedules.
   $schedules['weekly'] = array(
       'interval' => 604800,
       'display' => __( 'Once Weekly' )
   );
   return $schedules;
}
add_filter( 'cron_schedules', 'dctit_cron_add_weekly' );

//flush W3TC Cache - all of them
function dctit_flush_w3tc_cache() {
    if ( function_exists('w3tc_flush_all') ) {
        w3tc_flush_all();
    }
}
add_action( 'dctit_flush_w3tc_cache_hook', 'dctit_flush_w3tc_cache');

//schedule cron event - weekly
function dctit_flush_cache_event() {
    if ( ! wp_next_scheduled( 'dctit_flush_w3tc_cache_hook' ) ) {
        wp_schedule_event( time(), 'weekly', 'dctit_flush_w3tc_cache_hook' );
    }
}
add_action( 'wp', 'dctit_flush_cache_event' );