Knowledge is eventually gained, someone would have built practical devices relating to nuclear fission, whether that was a bomb or a reactor.
Nazi Germany would not have done that in any time frame relevant to WWII. They specifically rejected aspects of atomic/quantum theory because they were tainted by "jewish science" which unknowingly set them back decades and sent them in the wrong direction. As much as they were obsessed with super weapons, they were very unscientific in their R&D.
Sure. But in the first Fast and Furious movie they're not driving syncro-less transmission semis. They're driving tricked out sports cars in a straight line and somehow having about 14 gear changes in a 6 speed manual.