When can I FILE my application for US citizenship? " Specifically time of FILLING , not time of eligibility " ?

Yes, your question is clear. Although you can file in January 2021, I highly recommend that you wait ... CIS officers are more strict when they...

Why can't you file your 485 right away? No, the I-824 isn't an appropriate form for this situation.

Petitoner entered wrong I-130 name spelling (AMMAR vs AMAR) and DOB supposed to be 6 but was entered 4.

Put the correct information on the DS-260 and the consular visa officer can make corrections.

LPR stuck outside the US due to Covid-19?

As long as her absence is less than 12 months, she should be able to get in with her greencard. As for a 6+ month absence ... yes, this could be...

A W-2 is good. You can also provide recent paystubs, driver license, credit card statements, health insurance & any other documents with your...

The color of the paper is meaningless. What did the 'paper' ask you to do, or tell you what CIS will be doing?

Laid off in OPT in this Pandemic

Under his current OPT he can be self-employed

Can Employer A move or transfer approved PERM application with applying for I-140 to Employer B ?

A difficult question to answer without reviewing the specific paperwork of the PERM and prior I-140

With such a complicated set of facts ... why in the world did you go to Brazil? Are you still in Brazil? If so, what is your status...

Yes, USPS is still delivering mail. CIS regularly moves files around for efficiency purposes.