US Immigration from Egypt

I know that before the interview it's necessary to register the address online in order to return the passport.

But, is it also needed to register the actual appointment date online?

I'm seeing some conflicting information and travel.state.gov doesn't really make it clear.
https://travel.state.gov/content/travel/en/us-visas/Supplements/Supplements_by_Post/CRO-Cairo.html

Since the Public Charge rule is no longer in effect, does this mean we no longer need to bring the DS-5540 to our visa interview?

After uploading all documents and payment of F3A fees on CEAC, we received Om April 2021 an email from NVC that all documents and fees are approved and that NVC will send to Cairo embasssy to schedule an interview

that was after the filing date

Now my questions:

1-what is meant by the Final action date?

2-What is the next step(s) that will happen ?

3- can we expect an interview before the final action date ? Or it should be after it

I'm confused about whether we are supposed to bring financial evidence and the affidavit of support to the visa interview as I'm seeing conflicting information.

On the interview preparation page, as picture below, it says it is not necessary to bring the Affidavit of Support or financial evidence submitted to NVC.

However, this appointment letter checklist (for example) states the Affidavit of Support and recent tax returns are required?
https://travel.state.gov/content/dam/visas/Supplemental/appt letter_checklist for interview.pdf

So, I'm confused. I guess we should just bring them anyway to be on the safe side?

On that same note, we do need to bring the most recent tax information right? I, the petitioner and first sponsor, have not filed taxes as I didn't have an income. So, do I need to create some word document stating that or can I just verbally tell them the reason why I didn't file? As for the joint sponsor, she filed her taxes already but had to pay in. She's already sent me her needed W2s but I think she doesn't have a tax return, is it sufficient enough to provide her W2s and Tax Receipt from where she paid? Please advise.

Is it okay to renew the passport which was uploaded to the NVC?

Can I renew the passport and bring the new one and old one to the visa interview or will the new updated passport cause a delay since it's different from what was uploaded to NVC?