They are suppose to start beta testing in August, you can sign up to receive an email when they start taking applications for the beta at starlink.com. Nationwide rollout isn't suppose to take place until 2021 although the entire system won't be complete for several more years (though much of the later years is simply to add additional bandwith and redundancy).
The USA is obviously the first place it will be fully functional should all go well...
If it works reliably now, it should only get better as the technology gets better and a learning curve of managing it all gets better...
Heck I might consider coming out of retirement to work in tech support for them...
If the service turns to work as described, you should be able to provide tech support from anywhere, live remote and work for them...that would be ideal..
Thanks, I signed up.
Northern U.S. and southern Canada will have initial coverage.