Is there a getting started guide for golang?

Not yet… Go is still in preview but we are actively working on it to ship GA in 2.0, including the docs. This Slack is your best friend for now.

are there any commits on when that will be delivered ?

The plan is this quarter https://github.com/pulumi/pulumi/wiki/Roadmap#q1-2020

will tf2pulumi eventually support Go ?

Eventually yes, not sure when, probably not in Q1