Is it correct the postmark on 12/23/2016 instead of filing date will be determined the USCIS new or old fees?

If it reads "Applications and petitions postmarked or filed on or after December 23, 2016, must include these new fees or USCIS will reject your...

Date authorized period of stay in I-94 while filing i-821 form

You provide an addendum with the explanation that your I94 says F1 D/S and D/S stands for duration of stay. Provide a copy of the I94 also.

Can I submit my late Temporary Protected Status application as a Nepali Citizen for the first time now?

please see https://www.uscis.gov/humanitarian/temporary-protected-status/temporary-protected-status-designated-country-nepal

I would not send it separately (as no guarantee they will connect it with your file), you can wait for the RFE or present it at the interview.

You should complete form Ar11 to inform USCIS about your address change. You should also make sure you are getting all your mail (that is the mail...

What is administration decision

The information you have provided is not clear. Please talk to an immigration attorney. Provide them with your immigration file for review.

I-751 green card

You will have to list all the addresses you resided at and will likely need to provide an explanation for the discrepancy which should be doable if...

Basically means that a supervisor now will review the documents to see if more documentation is required prior to processing. This will cause...

I filed a change of status from J1 to F1 4 months ago I want learn that ıf my case denied after 6-7 months ,wıll ı be illegal?

1, You would accrue unlawful status as of the date the J1 expired if there was denial 2. You would need to leave the US asap

I-485 AC 21

If you have a new offer, then these questions should be addressed with the new employers immigration counsel.