Hi!! I am doing my interview out of Stockolm soon, and I can tell you that after my case was transferred to the Embassy by NVC (at the time, in March/April) that was taking about a month, it took less than a week for my fiancé to receive the Packet 3 or Embassy checklist. He got it via email, we never received it by mail, although I don't think you're supposed to. To prepare for the medical, I'd recommend just having your vaccination records in order and at hand, and if you need any other documents, the medical office will let you know what you need to bring after you book your appointment. I had to bring my glasses/contacts, 3 passport-style photos and documentation from a chronic illness. The I-134 I'd recommend having the American in your relationship start collecting everything now, so it's easy to fill out, and you will need to bring W2s, letter of employment, etc, to your interview appointment.