Just an additional comment.
Germany had at least two nuclear weapons projects.
One under Werner Heisenberg for Kaiser Gesselschaft (KWA) ultimately leading to Houtermann's Plutonium A-bomb. The attack on Norway's heavy water frustrated but did not stop that project. This project even with enough heavy water would not have produced a Plutonium weapon before 1951 at the earliest.
The other Heereswaffenamt project (HWA) under Kurt Diebner could easily have produced a Uranium A-bomb by 1945 but was sabotaged by British spies and bombing of the Uranium enrichment plants. Hateck had a huge sum of money granted in early 1944 to build massive banks of centrifuges.
With the bomb plot against Hitler on 20 July 1944, the SS took over both the V-2 project and the Heereswaffenamt project, but Himmler and Kammler were trying to use it from October 1944 to negotiate a secret surrender to USA.
It was this which saved the west from Hitler's A-bomb. It was questionable whether Nazi germany had a viable aircraft to deliver the weapon over London or New York or London by late 44.
There was also a nuclear project by the Kreigsmarine to produce a nuclear powered type XX1 U-boat at Stettin plus the Lafferentz V-2 capsules for U-boats to tow a V-2 accross the Atlantic to fire a V-2 at New York.
Quite chillingly the test protype capsule was never accounted for after the war and Enigma intercepts suggest U-873 did in fact tow it across the Atlantic before VE day.