While I may be wrong I thought that the discovery of the Holocaust would be only after the Allies won the war in Europe and after Hitler committed suicide. Correct me if I am wrong though.
[This recent answer of mine(https://www.reddit.com/r/AskHistorians/comments/g3k29i/was_there_ever_a_point_during_ww2_where_the/fnsjakt/) discusses the extent of Allied talks about peace talks, which were only seriously considered in the spring of 1940.