In 2017.I suppose what (possibly) is not great depending on how you spin it is that a stead ramp to hit 5,000 cars per week in Q4 may mean that we're realy talking late December to hit that number -- which likely means no one, or possibly very few people outside of internal Tesla Employees or current Tesla owners will actually take delivery of a Model 3.
I hope no one is suprised by the high likelihood that in 2017 only Tesla/SpaceX employees and current US Tesla owners will be the ones who take delivery on their Model 3 reservation. I've heard estimates (from Tesla personnel) that there are over 5,000 reservations made by Tesla/SpaceX employees,