WooCommerce New order notification if order total bigger than value

email_if_ordertotal.php

<?php 
// New order notification if order total bigger than value
add_action( 'woocommerce_checkout_order_processed', 'devise_email_if_ordertotal_bigger_than', 20, 1 );
function devise_email_if_ordertotal_bigger_than ( $order_id ) {

$order = wc_get_order( $order_id );

$total = $order->get_total();

$total_over = 500;

$admin_email = get_option( 'admin_email' );

$email_subject = 'ORDER OVER 500';

$email_body = 'New order over $500 is placed on shop';

	// if total is greater than 
	if ( $total >= $total_over ) {
		wp_mail( $admin_email, $email_subject , $email_body );
	} 

}