I think it depends on what loeffler and perdue want tbh, they are holding the cards as preserving the Senate is the goal right now. I think Bernie is doing a fine move here, but I don't think it amounts to much.
the NDAA is awful and will hamstring Biden from being able to withdraw from Afghanistan (not that he wants to) and is full of other dumb/bad stuff so it is a useful political football for Bernie. The path to the $2000 checks is pretty tough in my mind though.