We are going through implementation, and ran into issues with setting order 'Expected Date'. I want orders to be Picked/Packed/Delivered at the specific time every day. 

example1: Order for April 4h, afternoon delivery
I want this order to be available to pick and pack starting april 4th, 9am. 

example2: Order for April 5h, morning delivery
I want this order to be available to pick and pack starting april 4th, 1pm. 

Sidenote: If the order is for 20th of april, i dont want my packers to see it until 19th or 20th respectively. [depends if morning or afternoon]

It is my understanding that I can either implement this in the route, or order expected date. Routes seem less ideal since we have many warehouses/delivery times. 

Order expected date, at the same time, is a base field and cant be edited. 

Do you suggest we do a custom computation on Order expected date as a way to 'Delay' orders from being processed?