How to add "time for pickup" in the "checkout page" & "add-ons" to their "products template page"

Hi, my client, Brown Burgers asked me to add 2 new features.

  1. Add “time for pickup” in the “checkout page”, For example, 15 or 30 minutes.

  2. Add “add-ons” to their “products template page”, For example, add extra bacon or pineapple to the burger.

I tried a few different ways that I could think of, but I failed miserably. Can you please guide me on how to fix this?

Here is my site Read-Only: Webflow - Brown Burgers