These days the question isn’t whether the Fed will start selling off Treasury securities, but...

but how soon and by how much it will begin to reduce the pace of accumulation. 

Would a mere “tapering” by the Fed from its current $80 billion a month in Treasury purchases bring about an economic contraction?

Judy Shelton WSJ May 27, 2021 

https://www.wsj.com/articles/the-fed-lacks-precision-inflation-tools-11622153546