US Immigration from Taiwan

Is it necessary to bring a physical copy of the I-864 to interview?

Thanks.

About how much time is there between notice that interview is scheduled and the interview? Consulate is Taipei, Taiwan btw.

How long does it take to get the IR1 visa after interview?

Thanks.

A few questions regarding I-864

I'm the USC, my wife is the visa applicant, I have 2 children who are born US citizen, and I am using my brother(who doesn't live with me) as the joint sponsor.

1. So my household size is 4, my brother fills out I-864 and his household size is 2, is this correct?

2. On part 5 item 1, the answer is 1 (my wife). But on item 3 it asked me to enter 1 if I'm married, which would count my wife twice, what do I do here? Enter 0 for item 3?

3. On item 8 it auto-populates to 1, and I can't change it, what's up with that? Most of the fields I can fill in on the screen, but there are some I can't. Including part 5 item 8 where I can't edit the 1 which is obviously the wrong answer. What do I do?

Is this correct? More info, anyone? I can't find anything official from USCIS....just a couple reports about it buried in employment-based visa information.

USCIS Filing Fee Increase Deferred to Early 2024 | Latest Updates (iiusa.org)