Would you like your customers to be able to tip the delivery man upon checkout? You can do so by configuring the Cart Tips option.
Cart tips & Position
You can toggle enable/disable the cart tips function and set it for either the checkout page or the cart page with a placeholder text. You can also reposition the cart tips block within your page from here.

You can also customize the tip percentage, button placeholder text, and more.
When you’re finished configuring options from this tab, click Save Changes.