As of wednesday evening, the santa cruz county elections department still had about 20 thousand uncounted ballots, while in monterey county that number was about 40 thousand. The ballots that still need to be counted are the vote-by-mail ballots that were turned in at the polling places, or in-person after last saturday, the provisional ballots, and any ballots that were damaged (and need to be remade).
The law gives each election department until november 30th to certify the final election results, so no tally will be final until the results are certified.
Vote-by-mail ballots must have the signature on them verified, which is why it is critical for each voter to sign the envelope as instructed.