In my experience so far, Waymo costs about the same as an Uber when you take into account tipping, but takes longer (they're not yet doing freeways). With the addition of SFO to their zone, I can't imagine freeways are far behind, because getting from the city to SFO without using the freeways would be... a novelty.

That's not been my experience... 90% of the time when I check, Waymo is still a good 20-50% more expensive in SF, when comparing to a tip-included Uber or Lyft price.