显示客户WooCommerce的总节省

I am trying to get a total for all discounts (in dollar amount) received by the logged in user to display in the Dashboard.

I aim to display a notice saying something like 'You have saved $XXX while shopping with us!', however the below code is not working. It just displays the total amount of orders the user has made.

I am looking for a PHP solution and hopefully to minimise the need to access MySQL as I am not very experienced with that language yet.

global $woocommerce;

$customer = wp_get_current_user();

$customer_orders = get_posts( array(
    'numberposts' => -1,
    'meta_key'    => '_customer_user',
    'meta_value'  => get_current_user_id(),
    'post_type'   => wc_get_order_types(),
    'post_status' => array('wc-completed', 'wc-processing'),  //'post_status' => array_keys( wc_get_order_statuses() ),
) );

$total = 0;

if (!empty($customer_orders)) {

    foreach ( $customer_orders as $customer_order ){

        $order = new WC_Order( $customer_order->ID );
        $total += $order->get_total_discount();

    }   

}

echo count( $total );