WooCommerce - Add column to product list view

<?php
// add a new menu order column to the product list view
add_filter( 'manage_product_posts_columns', 'custom_product_posts_columns', 99 );
function custom_product_posts_columns( $columns ) {
  $columns['menu_order'] = 'Menu order';
  return $columns;
}
// show the value
add_action( 'manage_product_posts_custom_column' , 'custom_columns', 10, 2 );
function custom_columns( $column_name, $post_id ) {
  switch ( $column_name ) {
    case 'menu_order':
      $product = wc_get_product( $post_id);
      print $product->get_menu_order();
      break;
  }
}