I live in Alameda County and disagree with your prediction that the vote will be over 90% Yes. Alameda County voted only 62% against Prop 8 in 2008 (much closer than SF/Marin where the vote was 75% against Prop
. I would guess Alameda votes about 80% in favor of repealing Prop 8 while the margins in Marin and SF are 90% or more. I'm guessing the vote statewide will only be 65-70% in favor of repeal. The county votes will likely be very similar to Prop 1 (2022) for reproductive freedom. That Prop passed 67% statewide and no county voted +90% in favor.
https://en.wikipedia.org/wiki/2022_California_Proposition_1