Instead of using a 3rd Party application to handle this you should include it so we can make the most of Debutify Cart.
Make it so a customer can select a specific date and time to pick-up an item in a physical location.
See "Order Delivery Date and time" application on Shopify app store for an example of what we use.
Please make sure this includes not only click and collect of goods at a physical location but also a preferred delivery date for shipped items
Thank you for adding a feature request,
we appreciate that you are concerned and want us to improve.
You will be happy to know that We are considering adding it to our theme soon. Have a great day.