Employment Based Greencard

Hi all, I had my EB3 interview on October 30th and per my lawyer feedback, it was a very smooth and uneventful interview. In fact, it only lasted about 20 minutes. At the end of the interview, the IO handed me the white paper that has three options and marked option 1, and told me that it can take up to 60 days to hear about them. I have been checking my status online and yesterday I got a text notification saying this:

On November 4, 2019, we sent you a duplicate notice about a decision on your Form I-485, Application to Register Permanent Residence or Adjust Status, Receipt Number MSCxxxxxxxx, or describing how we will process the case if it is still pending.

Your case is located at our National Benefits Center location.

Please follow any instructions in the notice.

If you do not receive your duplicate notice by December 4, 2019, please go to www.uscis.gov/e-request to request a copy of the notice.

If you move, go to www.uscis.gov/addresschange to give us your new mailing address.

I have a little bit concerned because it says that my case is now at the NBC. Also, I have seen many people who got approved, they receive the approval notification online and mine only says that they sent me a letter with a decision. Should I worry about it? It has also been 6 days since they mail the letter and I hasnt received it yet.

Any thoughts?

Thank you!