Like history records, Hitler insisted on a hot war with the USA, no matter what he had said in his earlier writings (he also originally said that he merely wanted Jews out of Germany IIRC). And if he had held onto the nuclear scientists we got out of Germany, we could have seen an atomic holocaust too.
He wins Barbarossa, peace with the UK and let the cold war begin.....PS: The Krauts were a decade away from a ‘bomb’ in ‘42.