At this point, let’s not even ask about the full Crossrail service pattern, let’s ask whether any services will be running through the core before the SF Central Subway opens!
And you're expecting the Central Subway when?
In January 2018 the expected opening was 22 months away; by June 2020 it was... down to 18 or so months away.
For the record, I haven't been proven wrong yet. (I voted for the SF Central Subway, although I seriously considered Brandenburg Airport and nearly voted for it.)
