OP that's great news! I have been out of work for a year, but home with my toddler. I completely get all the stuff you've mentioned. I'm ready to go back to work to rest too, lol, but I'll miss being home at the same time, and I know my DS and my dog will be sad. (hopefully I can find daycare DS will love so he won't mind as much)
I have worked at the post office a few times in my life - my mom was a career employee and that helped me get summer jobs there while in college. Its HARD work! Your DH may come home more exhausted than you'd think, especially until he gets used to it. I worked the overnight shift for a couple of summers, and one summer I was a fill in carrier when someone was on vacation. That was really hard work - people are not polite to a fill in carrier who brings their mail later than the regular carrier, sometimes you get lost on a route you don't know, the trucks take some getting used to, etc. Just prepare yourself that he may find it more challenging than he expects! I know people joke about the post office being a place where no one works much, and for some long timers that's true, but definitely not the temps! (and not most of the regulars either)