So, at the interview, everything went well but the CO asked for a copy of the petitioner's previous marriage certificate, a document that is not listed anywhere as required.
The visa was refused, pending receipt of that document (and translation). Status on the CEAC website still shows Ready. The date of the last update was updated to reflect the date they received the requested documents.
From another member's recent case, it takes about 4 to 5 weeks to process. We are on the third week so far and are waiting for updates.
Hoping it will not take longer than that