Records are still a preview feature in Java 14 (Apr 2020). Java 15 (Fall 2020) contains a second preview. They're usable, but you have to pass a flag to the compiler to enable them, and you run some small risk that the syntax will change (it's pretty simple, so I'd guess that won't happen).

I'm guessing that they'll land in Spring or Fall 2021, but that's just an outsider's guess. The really important cutoff is Spring 2022, when Java 18 is intended to be an LTS version.