Received my 48 month extension a week or so ago, expiry date on my physical card is 03/18/2022 and they issued the new extension on March 6.
I'm really thankful, we moved states so this confirmed that they updated my address correctly and also prevents a 3-4 hour trip one way to get the stamp for at least a little while!
We're at Potomac so....who knows how much longer I'll be waiting 😥