They have already started mass production of the cells at CATL, etc. I would guess building packs and larger products on that will take some development, a year or two? But I see 18650 sodium ion cells on Alibaba, although I couldn't say if they are actually as advertised.
Edit, I suppose it depends what you mean by consumer use. Are you asking when they'll be in every corner hardware store? Or when people can buy cells/packs for DIY projects online (which would be something you can do now).
You will be pleased to know that Lemmy went to the source a few weeks back: https://lemmy.sdf.org/post/151820
To be fair, I think the idea would be to change the albedo of Earth so that more sunlight is reflected back into space. But it would need to reflect more light/heat than it produces in waste heat for the refrigeration, who wants to do the math?
@synthllama
@lemmy.sdf.org