US Immigration Questions

My concern is about the Applying for Citizenship for myself and spouse, and with our passport and GC expiring criteria.
My GC and my spouse’s GC have a expiration date of Sep-2023
My Indian Passport have expiration date of Jul-2024 and my spouse’s on Mar-2026
I am pretty much ready with all the documents (been working on it for some time) to start our citizenship application by myself, according to the U.S Naturalization website for my region (New Jersey) it shows the processing time as 16 months. And if I apply now, during the processing period my GC will expire.
Is it okay to apply for citizenship now and then around July start my renewal of GC? Are there a process to update GC info after a citizenship application is submitted and is in processing? Would any part of GC numbers change when I get renewed? Or would you suggest that I renew the GC first as soon as I can and then apply for citizenship? If I do this then I will have to renew my Indian Passport as well I think, if there is not enough time.

1. I am on H1B VISA and was notified that my employment will end on January 20th. I am actively seeking new job opportunities. Can you please let me know what happens if I am still interviewing after 60 days and become out of status? 
2. Do I have any other options to change my VISA status before/after my employment is terminated and I fail to secure a job before the 60-day period is over? 
3. Does my VISA become invalid after the 60 days or can I still find a job and reactivate it if I get an offer after the 60-days?

Currently working with Employer B.
My PD - EB2 India, Aug 2013 with old employer A
Sep 2022 - Filed I485 with Employer A's I485J (which he provided that I will join his consultancy company)

1. I always intended to join him but we couldn't find a new project in this market. He mentioned he is going to withdraw the I485J and I140.
2. Will it be a right-away denial, RFE or USCIS will issue NOID?
3. If USCIS issues RFE/NOID and the response date is after the 180 days mark - Can I provide 485J from my current Employer or any other employer or self-company?

Background:
Working in the US on H1B, approved I-140 7 Years back in EB2. Now, there is an opportunity in my current company to manage 1 or 2 employees outside the US. And the same in the US. If the EB2 India dates don't have a good future after this year, I am thinking of going out of US work in managing capacity and coming back on L1A and trying EB1C.

1: With just 1 or 2 employees (senior resources e.g. VPs or AVPs in the financial domain ) reporting to me, how are the chances to get EB1C approved?
2: In your opinion, do you see EB2 India touching 2015 anytime this year, considering they have some spill over from last year? Or you suggest a plan for EB1C if the situation exists?

Have any rules changed regarding getting a spouse visa through H1, L1, or O1? Also is traveling on a tourist visa to the US after marriage not ok, with a pending GC application? Finally, does the US have any special agreements with the UK, EU, Singapore, Dubai or Australia for visas that may qualify in this scenario?

My I-140 and I-485 is pending, my OPT has  expired. Can I stay back in the U.S until I get my green card EAD ?

If someone is on L-1 and got laid off, what are the alternatives?

Can I visit Canada with a valid F-1 Visa or do I need to take another visa ?

Is there a possibility of getting approval for H-4 visa work authorization act this year?

If I were to file for F-1 but my H-4 was going to expire would I have to file for an H-4 extension?