If it helps anyone, here is what happened with my case.
Married couple (Sri Lankan)
Field Office - Lincoln, NE
December 23, 2019 We received your Form I-485, Application to Register Permanent Residence or Adjust Status.
December 31, 2019 We accepted the fingerprint fee for your Form I-485, Application to Register Permanent Residence or Adjust Status. Our Nebraska Service Center location is working on your case.
February 3, 2020 The fingerprints relating to your Form I-485 Application to Register Permanent Residence or Adjust Status, were taken.
March 6, 2020 Received our EAD cards, valid for a year.
September 1, 2020 I140 was approved
September 25, 2020 We transferred your Form I-485, Application to Register Permanent Residence or Adjust Status, to another USCIS office that now has jurisdiction over your case.(transferred from Field office in NE to the National Benefits center in MO)
November 3, 2020 We sent a request for initial evidence for your Form I-485, Application to Register Permanent Residence or Adjust Status.
December 4, 2020 USPS delivered the medical I693 to NBC in MO, (didn't require any signature at receiving, mailed to the PO box via USPS) (Just to be clear the online case status didn't change from November 3 to January 12)
January 12, 2021 New Card Is Being Produced
We were in the process to apply for EAD renewal (no USCIS fee for that) as it was expiring in 2.5 months. Also, note, we didn't have an interview. The online status changed from "Sent for RFE" to "New Card is Being produced".
Now we are waiting to get the GC in hand. I highly recommend creating a USCIS online account which gives you the history and supposedly a tracking number for the GC. I will update that once I receive the GC. For now hang in tight. Hope this helps. Good Luck.
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