Thank you all.
Yes. It says "Valid for work only with DHS authorization". I entered the US via K1 (fiance) visa and got my SSN a few days after entering the US.
Since then I received my conditional green, and a few weeks ago, my citizenship.
I am employed and according to my employer my status is a gc holder ("lawful permanent resident").
My goal is to receive my passport, then visit SSA and update them.
Once that's over I can go back to my employer and claim I'm a USC so if they verify, the records would align with my status.