Yes. You can, I do, and it works. Make sure to read the terms of use for whichever generator platform/tech you use, but most explicitly allow for this.

The murkiness around copyright status is not a prohibition on selling AI art. Even if clear guidelines are established stating that works made with AI aren't covered by copyright, that doesn't prevent you from using AI and selling the results. It just means a company with more money can copy your work and sell it themselves too, even if they cut you out of your own market. For that reason, large companies won't pay to produce art they can't own the rights to. But unless you're independently wealthy, you're probably not paying to enforce your copyights even if you own them.

Some people will recommend lying about how you make the art, because the internet feels so hostile towards AI art. You don't need to do this, and probably shouldn't. AI art is cool enough on its own, and it's scummy to lie about what you're selling. But don't worry, in practice lots of people are excited by AI art and happy to buy a piece that impresses them, even when they know exactly what they are seeing.

Edit: All of the above is assuming you aren't actively infringing on someone's IP with your AI art. A generated image of Mickey Mouse fucking Batman is going to piss off two different large companies, and they'll have the right to make you get rid of it.