Let's suppose that WWII ended to stalemate between Germany and USA (both have nuclear weapons, or neither have nuclear weapons but German won USSR and perhaps beated Invasion of Normandy).
UK would probably have been surrendered, and probably Germany would have demanded it to extradite Jews to Germany (or occupied Britain and killed them directly in British soil).
But what about American Jews. Do you think that Hitler would have been interested in them, if open war between Germany and USA would have been impossible.
I think that at least assisinations (or attempts of them) by German agents would have been probable against famous Jews, e.g. Einstein.