When does BFR fly hop tests, high-altitude tests, and orbit?

“…we still anticipate doing opera flights next year and then depending upon how will this go we'll do high altitude high velocity flights with the ship in 2020 and also start doing tests of the booster and if things go well we could be doing the first orbital flights in about two to three years…”

— Elon Musk, 17 September 2018 · Watch: SpaceX BFR Lunar Mission Announcement · 1:03:51 ↗