That is an unbelievable work schedule! I agree that it probably wouldn’t work to go to the gym when you’re working from 8am-10pm, six days a week. It might be possible if you had a gym very close to your house, or near the bakery, but in your situation I doubt you’d have time.
But there are lots of things you could do, some of which you have mentioned. Depending on how you feel in the morning, you might consider doing a body weight circuit before your shower. I’m sure you could google up some good programs, but try to hit all your major body parts. If you bought a pair of dumbbells, you’d have a lot more options, but I don’t think they’d be necessary.
To get some cardio, you could alternate daily between resistance training and taking a neighborhood jog. You could get a great work-out in only 15-20 minutes a day. For me, the only difficult part would be finding the motivation that early in the morning, but it would definitely work if you keep it up.