shebcs

Well, the job offer PLUS the documented liquid assets.
 
Lot's of overreaction to notices from NVC that mention joint sponsors but also say the Consulate will make the decision.  If the case has been DQ'd and the assets are sufficient, there's nothing to worry about and no need for a joint sponsor.

No worries dude.  Wow, might have been my bad.  NVC are glorified clerks.  
 
Yes, fix that at interview.  Procure two.  Your with assets only, try it.  Have a backup just in case, they won’t deny outright they’ll give the beneficiary a chance to provide a second one.
What you got I believe is a “form letter”.  Rules are clear at interview time, a job offer should clear you right through on your own affidavit.
 
Good luck!

You received the standard notice from the NVC. Good thing is that NVC has passed the application to the Consulate for interview and decision. You have a far better chance there ..  
Prepare new I864 for both you and the joint sponsor that reflects all  changes .. financial situation as addresses.. and have your spouse take all these to the interview.  It is not uncommon for these things to change between the time of submission and interview. No need for an I 865… there is actually no “ joint sponsor “ in place yet so there’s no address to change. 
 
Best safe guard is for  you to have reestablished residency and have 2-3 payslips in hand for her to take to the interview. This negates the challenge of having assets accepted and needing a joint sponsor. Having in hand a firm job firm job contract plus the back up of your assets is the next safest option but no one can tell you what will be definitely “enough”, as it all in the hands of the interviewee 
 

If the case has been forwarded to the embassy the correct thing to do is bring the updated information to the interview
I thought this was hung up in NVC and couldn’t figure out why

Hi. As it turned out. I needed those documents they asked for. I submitted them and about two weeks later we were document qualified. We are still waiting for our interview as the embassy is relatively closed. 

Yes, that's the timeline.
I'm not sure if there is a variance.
I believe it resets your line if you upload something new. First submission doesn't hold its place. 

What address is listed for your bills, statements and voter registration?   Use that if it is still valid, or your parent's address.  No need to add the email about asking your parent's permission.
 
You can always update your address later with USCIS when you know where you want to live.