Thanks again Susie, My son junior, he will register for selective service when he turns 18 this September. Maybe he will be citizen if we finished our Citizenship process with this time ( I have doubts to finish it in 3 months) We will apply 90 days before the 5 years GC. Hope the USCIS reopen next month. Do you think we still apply and send our application or we have to wait until the offices reopen?
Send your application in when you can, they are still working, just not on things that need public interaction.
I would suggest (1) filing online (it tailors the questions to you, guides you to the exact evidence you need, you get immediate priority date and receipt #) and (2) wait a couple of days after the 90 day mark because sometimes the system glitches and sets the Viking date as the day before. It will still get notice of receipt earlier than mailing it in.
The process is varying widely according to where you are, it took me over a year, I think 3 months is quite rare these days.