Next day pickup/delivery can be accomplished with lead times, cutoff times, or a mix of both.
Lead times add a delay before the earliest available time slot.
Cutoff times hide availabilities for the day if the customer is past the cutoff time. The cutoff time calculates based on now but applies to the next available date, whether that be today or in the future (if combined with lead time).
The easiest way to set up next day pickup/delivery would be through setting a cutoff time.
Start time: 10 AM
End time: 5 PM
Lead time: 3 hours