Youbi

The 221g is a temporary refusal, until you submit and they review and approve the missing documents. No way to know how long that will be, could be some weeks or possibly longer from when you submit.

It'll change when they're ready. Anyone that tries to give you a definitive timeframe is lying. Could be days, weeks, months...especially not knowing what country you're in. You just need to have patience. You're so close!
 
For what it's worth, it's a good sign that they kept your passport.

^ this. In fact CSPA age freezes even before interview, when DS260 etc are submitted after priority date is current.
It could take some weeks for them to review the documents, they won’t drop everything else they are doing to check your documents when they come in... it is probably somewhere in an in-tray of similar such documents..

You're not going to age out.  You've had your interview, so your CSPA age has already been locked in.
 
It has been a week.  You need to give it time.  More patience my friend.