The original plan was to release in February, but in the Beta 2 release [1], they said this: "Because we are taking the time to issue a second beta, we now expect that the Go 1.18 release candidate will be issued in February, with the final Go 1.18 release in March."
It looks like there are still a few release blockers [2]. I'd imagine RC is fairly soon though.
EDIT: as mentioned by _fz_ below, RC1 has already released. Seems like the full release will most likely still be in March.
Well, not quite 2 weeks ago; it'll be 2 weeks on Thursday. I say this because policy is to issue a release "no sooner than two weeks after" issuing the release candidate.
go1.18 is coming out soon with generics. The first release candidate came out 2 weeks ago. You can track the open issues here: https://github.com/golang/go/milestone/201