Hello,
Within the order taking app the restaurant needs to insert the number of minutes by design.
During non-peak hours, the restaurant can estimate that the kitchen fulfills an order in 20 minutes for example. During peak hours, the restaurant can estimate that an order is fulfilled in 50 minutes, for example.
Which is why for orders for NOW, the restaurant needs to insert the number of minutes in the order taking app, instead of a fixed hour.
If we were to implement such feature in the manner described by you, the restaurant staff would need to check the current time and calculate the exact hour they would need to set as the fulfillment time, which in turn would create even more logistical issues.
Therefore this is not something that we will add to our roadmap. For orders for now, the restaurant will need to insert the number of minutes.