[cityofdelusion]

Realistically speaking, Germany was never on track to produce atomic weapons before their war economy was obliterated by the allies. The program was not taken seriously or had proper investment. The war machine was already severely starved of resources prior to their even more significant land losses in 1944. I honestly can’t even think of an alternate (realistic) timeline where they achieve a delivery system for atomic weaponry.

[southernplaces7]

The delivery system would have been mostly irrelevant if they'd gotten the bomb on time. Having even one functional nuke at any time at all before or just shortly after June 6th 1944 and dropping it on London or even around the Normandy beachhead (well within German reach even in 1944) would have pretty much killed the D-Day landings stone dead immediately, and that was something they certainly plausibly could have done if it had been taken seriously by the leadership early enough. The V-Weapons program alone cost MUCH more than the Manhattan Project, for example, and it was (despite being technically incredible for its time) a total waste of resources under the circumstances.

The Germans also spent so much money on so many absurd things that had they simply directed it more precisely to the bomb at an earlier time, cost at least wouldn't have been a limitation. Even as things stand historically, they created a number of completely cutting-edge weapons despite all the catastrophic problems you describe, so much so that the US, USSR and UK all spent years after the war, largely cribbing off what the Nazis' R&D had already developed to some extent.

[michtzik]

B-29s dropped the atomic bombs. The B-29 project was also more expensive than the Manhattan project: > The $3 billion cost of design and production (equivalent to $52 billion in 2024), far exceeding the $1.9 billion cost of the Manhattan Project, made the B-29 program the most expensive of the war.

https://en.wikipedia.org/wiki/Boeing_B-29_Superfortress