About the same time fusion power becomes viable.
Fusion is viable. At least, it's a viable technology and route. Perhaps a generation or two away at the long end of the scale (So long as no more oil companies continue with their smear campaigns to get research funding dropped)
Antimatter weaponry probably isn't going to happen, simple as.
Matter-Antimatter annihilation is hilariously inefficient for any kind of notable energy release. The amount you'd need to make such a bomb worthwhile (and the size of the bomb itself) is incredibly hard to fathom or put into words by technology that can even be thought about today.
If, somehow, there were a way to get enough, though, there's still the little issue of containment. It would need to be kept safe and sterile of any potential matter contact, and doing that would need a very powerful, very stable electromagnetic field with multiple failsafes built into it.
Long story short, it's taken us this long and this much technology to be able to hold antimatter for fractions of a second. This is very, VERY early days for experimental antimatter research.
Positive-yield Fusion, though? That's frustratingly close, all things considered.
I don't know where you live, but here in America most fully electric cars are ineficient, and the ones that aren't are too expensive for most people.
I think that's Holm's point exactly. If the oil industry didn't stifle the research for so long, the technology would be leaps and bounds ahead of where it is now.