在订单视图列WooCommerce中显示自定义字段值

I have this code which creates a drop-down on the product page. It saves the data chosen and it displays on the order. What I am need help with is displaying the value in the custom column.

Here's the code:

add_action( 'woocommerce_product_options_general_product_data', 'costcenter_management_group' );
function costcenter_management_group() {
global $post;
echo '<div class="options_group">';
woocommerce_wp_select( array(
'id'      => '_cost_center',
'label'   => __( 'Cost Center', 'woocommerce' ),
'options' => array(
'One' => __( 'Office One', 'woocommerce' ),
'Two' => __( 'Office Two', 'woocommerce' ),
)));
echo '</div>';
}

// save cost center settings
add_action( 'woocommerce_process_product_meta', 'costcenter_management_group_save' );
function costcenter_management_group_save( $post_id ){
if( isset( $_POST['_cost_center'] ) )
update_post_meta( $post_id, '_cost_center', esc_attr( $_POST['_cost_center'] ) );
}

// display on order
add_action('woocommerce_checkout_create_order_line_item', 'costcenter_management_group_display', 20, 4);
function costcenter_management_group_display($item, $cart_item_key, $values, $order) {
if ( $cost_center = $values['data']->get_meta('_cost_center') ) {
$item->update_meta_data( 'Cost Center', $cost_centre );
}}

// add cost center column on order view (WC admin)
add_filter('manage_edit-shop_order_columns', 'costcenter_management_group_column', 10, 1 );
function costcenter_management_group_column( $columns ) {
$actions_key = isset($columns['wc_actions']) ? 'wc_actions' : 'order_actions';
$order_actions = $columns[$actions_key];
unset($columns[$actions_key]);
$columns['cost_center'] = __("Cost Center", "woocommerce");
$columns[$actions_key] = $order_actions;
return $columns;
}

I know I can use echo but I don't know which value I'm supposed to use?