Woocommmerce show SKU in cart page

Add the following code to your theme’s functions.php file, or as a new plugin:

add_filter( 'woocommerce_in_cart_product_title', 'add_sku_in_cart', 20, 3);

function add_sku_in_cart( $title, $values, $cart_item_key ) {
  $sku = $values['data']->get_sku();
  return $sku ? $title . sprintf(" (SKU: %s)", $sku) : $title;
}