From what I've been reading on this list, having someone out of inpatient and back
at home too soon doesn't usually go well.
If you aren't sure you want him back right after he finishes, tell him soon while he is there
so they can help him find sober living situations and he can process it with the therapists.
Of course, only you can decide, but it seems like that is such a critical time for his recovery and he may be very up and down and fragile as you will be too.
Some time apart might help you both and put things on a more steady footing.