US Immigration from Canada

Hello, I've been in the process of filling out the I-129f and organizing my evidence. I was just wondering if i'm including chat history from apps like Discord or Whatsapp where our usernames are not the same as our real ones do I need to include those usernames as an alias in part 1?

I have my interview next month, and in preparation I'm wondering what the time post-interview but pre-oath is like.

- Will I have my green card until I take the oath?

- Assuming I pass the interview, what is my "immigration status" before the oath - am I still considered a PR?

- Do you get documentation stating that you passed the interview?

- After I take the oath, can I travel outside the US before getting a US passport, or will that make re-entry tricky? I would be traveling to Canada.

Thank you!

To make a long story short, we had to stop pursuing our application for personal reasons beyond our control. We received notice that our application was sent to NVC in September 2021 and it was at that point we had some things to sort out here in Canada (our child had some medical concerns and lots of testing being done in Canada so we stayed here while they were trying to find what was wrong).

From what we can read online, I think we have to re-apply because the absolute max that NVC will keep your file is 1 year (2 if you have issues beyond your control) and we have exceeded both.

Has anyone had to start all over again? Did you run into any hiccups or any advice you can share that night be helpful?

We are ready to start again now that everything is, thankfully, all clear. Just looking for any advice or even to see if anyone has been in a similar situation of re-applying :)

I just learned that both myself and my 7 year old need Covid19 vaccines ( done in the last 12 months) as well as seasonal influenza (flu shot) done.

Does anybody have more information on this? How strict is this? Is there any flexibility in not getting these done and proceed with medical exam?