They would never have gotten funding for it. No way in hell.
Plus, war made sure that they put getting working reactors first. Not interesting science. A critique in fusion research is that nice, flexible and very accurate/complex apparatus is given preference over quick-iteration and fast experimentation. War made sure that the researchers went straight for the goal (and there is the fact that the Germans and the Americans both knew that there was probably a way to tickle the uranium reactors to result in Hiroshima. This caused the Germans to be careful, although even their experiments would today be considered absurdly dangerous. But the early American experiments were bat-shit insane). So thought hard about every step, and constantly fucked up (someone left 2kg uranium in a bath of water + cadmium by mistake, then walked out for the night : the first meltdown. They didn't figure out what had happened until years later. Someone inserted a steel rod into a barely sub-critical reactor submerged in water. No-one left the building alive (due to the water exploding as steam violently enough to bring the roof down, not due to a nuclear explosion). None of this would not have happened in peace time.
1) we never would have had nuclear power in the first place. (or it would have taken decades more)
2) It would even have taken a lot longer to develop oil energy and widespread cars (allied research on oil)
3) We wouldn't know about co2 separation (since the nazi state was cut-off -mostly- from oil, they researched liquefaction and nuclear power)
Nobody ever gives cruel losers credit, I guess. Heh. But the nazis certainly did a lot of useful research.