Hisman on Twitter: "By default, WooCommerce hides the free shipping cost. But, if you want to show it, you can use the woocommerce_cart_shipping_method_full_label filter to override the shipping label. https://t.co/Wl26I2aLhm" / Twitter
php - Add different custom labels to Woocommerce shipping methods - Stack Overflow
WooCommerce hide zero value on zero cost shipping methods | Cinch Web Services
Show Estimated Delivery Date in the Checkout Page of Woocommerce