Just paid my visa fees after receiving packet 3 from the consulate yesterday! I was a bit surprised that they asked me not to send my documents in advance, kinda assumed we had to do that.
Anyways, now it's just a matter of waiting for them to confirm my payment so I can schedule ❤️
Transit time seems to depend heavily on location. @PakistaniRussian waited for about a month I believe, mine was ready after 2 weeks.
Your fiancée cannot schedule her interview yet since your case is still in transit and not ready. Interviews can be scheduled once the consulate has received your case, upon which you'll likely have to wait for a confirmation email with general instructions on how to proceed (at least that was the case for me, I think some embassies may need prompting so if you're unsure I'd call to ask about their specific process once your status shows as 'ready'). Once you have confirmation from the embassy, you should be able to schedule your interview online – never heard of them scheduling appointments over the phone.