So, I guess that the Germans could not have built a Bomb before 1946 or so?
They had ballistic missiles before that, and one must bear in mind that their industries were being bombed for years, - what could they have done if they had been in a neutral status with the British and on the trade side with the USA.
And who would Niels Bohr have been doing his maths for?
Anyway, I'd put my money on this:
If Germans had cracked the Brits in 1940, they would have won over the USSR possibly in the autumn of 1941. Their line would have been drawn near the Urals with some resistance going on beyond there.
A conflict with Japan might then have happened when the Japanese would have collided with the UK colonies, - but by here something is missing into the equation.
the USA and Naval Power.