Solid state batteries get here when they get here, and ignore the hype. Over the decades I don't recall that I've ever heard a breathless battery announcement that's going to change the world, and then had that battery technology pan out when scaled to industrial levels. IOW, yeah, I'll believe it when I see it.
Buy what you need today, otherwise you're likely to "wait 3-4 years" and then, oops, those batteries are still five years away (as they always seem to be) and now you've waited nine years while driving a twenty (well, closer to thirty now) year old car.