If I understand the process correctly, as soon as the polls open tomorrow the elections offices that receive the mail-in ballots begin opening and scanning the ballots. Then, as soon as the polls close at 9pm, the stations reporting their results, and the election commission begins releasing the data as they come in.

I imagine there will be lots of "exit polls" taken, as well, but I don't trust their results. (An exit poll is a reporter standing outside polling stations asking voters who they voted for and how they voted on propositions.) I don't trust them because they ignore the huge numbers of early voters and mail-in voters. Surveys I've seen say that Democrats have a 4% lead in main-in votes, which heavily favors Prop 19. The exit polls will be biased towards GOP voters (a polite way of saying senior citizens... ) and could skew the results of actual voting.

I'll be waiting to hear the actual numbers.