With an interview on the 22nd, the problem is going to be whether the visa is ready that day, or the next which is the 29th on the consulate's calendar. If it's ready, you may be able to pick it up that day. Or on a day when the post office is open. If it's not ready, no one will be able to pick it up until the 29th. Either way, it would have to sit at the post office for 7 days (giving you 7 days to pick it up) before it is returned. That doesn't seem to be where your problem is.