Oh really? What about the British nuclear program and knowledge? And the fact that now whatever nuclear efforts Germany made won't be trolled to death by the Britain?
While this might be a bit of flogging a dead horse at this point, the German nuclear project was a complete trainwreck. On a number of levels the chances of the Germans producing a bomb at anything approaching a usable timeframe is pretty abysmal. For one, at the start of the war sustained chain reactions of fission were still purely theoretical as far as the Germans were concerned (Szilard and Fermi had proven it in '39, but sure as hell weren't telling the Germans that). German nuclear physicists were never willing to commit to the idea that they could build weapons (post-war a lot of them claimed they did so out of moral opposition to Nazism, when more likely it was just incompetence), and instead mostly focused on the promise of nuclear power.
Even if they had come forward and said they could build war-winning bombs, there was no reason for the German government to fund them. Practically all the country's resources were already committed to the war effort, and since they were victorious on all fronts until late '41, there was no motivation for diverting resources to doomsday weapons. And by the time they started to lose, it was too late to start with the potentially war-winning technologies (as played out with rockets, jets, etc.).
Moreover, even if they had committed to building a bomb, even if they thought a bomb was possible, compared to the Americans the resources they could invest were paltry. They had access to a tiny amount of uranium from Czechoslovakia, but were for obvious reasons cut off from the main stockpiles in the Belgian Congo. So they likely wouldn't have been able to scrounge up enough U-235 to build a uranium-type bomb. Even if they had, the resource demands would have been enormous, and would have consumed the vast majority of the entire Reich's electricity output if they attempted anything resembling the Manhattan Project (they hit upon three potential routes for isotope separation for a bomb: centrifuges (which turned out to be too inefficient and was abandoned), diffusion (gaseous, liquid, and thermal, all of which were carried out at Oak Ridge), and plutonium from a nuclear reactor (which was discovered by the Americans in '40). The U.S. decided to try every approach just to be safe). By comparison to the U.S., who built everything from scratch, the Germans relied exclusively on facilities and equipment looted from the occupied territories (cyclotrons from Paris, the Norwegian heavy water plant).
Moreover, the equipment and materials the Germans had access to were often very shoddy. The necessary machine tools took incredibly long times to build (in part because of war demands, but also because German industry lacked the expertise necessary) and was often sub-standard. The only reason they settled on heavy water for their reactor moderator was because the graphite used in earlier experiments was full of impurities and fudged the results (later, some of the German physicists claimed they deliberately sabotaged the experiments). The fact the Germans were even using heavy water was taken as a sign by the Allies that the Germans had fallen behind in any kind of nuclear race.
Worse, the nuclear power project was under severe ideological restraints. Einstein's theories had been dubbed "Jewish science" and proper "German physics" was put forward in its place. Werner Heisenberg, arguably the best physicist they had available (as Bohr and Joliot-Curie refused to work with the Germans) and who was in charge of the project, was almost blacklisted by the SS for his "Jewish science" before he appealed to Himmler and was saved. As for Heisenberg, he was a terrible project leader with little to no interest in its actual experimental work, to say nothing of the enormous practical hurdles to overcome. He was a theoretical physicist, and routinely went off to work on his own, unrelated, research. That is, when he wasn't drafted by the Nazis to tour European universities to give lectures.
The farthest the Germans ever got to a bomb was a couple of ramshackle tests of a heavy water reactor in '45 to achieve a controlled chain reaction, a feat Fermi had accomplished with a far better design in December '42.
Then there's the question of how they would even use such a thing. The Germans lacked a bomber with anything approaching the carrying capacity of a nuclear bomb.
