Cómo ordenar los productos del sitio de WordPress según el inventario

hi
I have a WooCommerce store website. I use this code to sort products based on inventory. But the code has an error. It dosent work corretct.please guide me. How to sort WordPress site products based on inventory?

Lo que he probado:

add_action('init', function() {
	if( isset($_GET['update_products_arv']) ) {
		$products = wc_get_products( [ 'limit' => 500,'offset' => 200] );
		foreach( $products as $product ){
			$total_stock = $product->get_stock_quantity() ? : 0;
			if( $product->is_type( 'variable' ) ){
				$variations = $product->get_children();
				if( !$variations ) continue;
				foreach ($variations as $variation_id) {
					$variation = wc_get_product( $variation_id );
					$total_stock += $variation->get_stock_quantity() ? : 0;
				}
			}
			update_post_meta($product->get_id(), 'xx_stock', $total_stock);
		}
	}
});

add_action('woocommerce_product_query', function($q) {
	if( ! is_admin() ) {
		$q->set('orderby', 'meta_value_num');
		$q->set('meta_key', 'xx_stock');
		$q->set('order', 'DESC');
	}
});