I think we tend to forget that many things can be implemented without "smart" features / wifi access / apps. Ie my 20 year old oven has a "start time" feature. It just uses the built in clock.
I don't think I know of any (big) appliance, e.g. dish washer, drier, washing machine with that option but to be honest I didn't dig deep, is it possible?
Timers have been on appliances since Desi first yelled at Lucy. Yes, it's possible.