Every time I call Tesla for status they say TOU is being rolled out by region. They are unable to say which region gets it when.
Yes, I've had time-based control since mid-May (in San Mateo). There are others in the Bay Area who also have it who post on teslamotorsclub: https://teslamotorsclub.com/tmc/forums/tesla-energy.159/
Yes. It is in beta. There are lots of quirky aspects and some good ones. I think the TOU is more price efficient, but I don’t think it cycles our batteries enough.