I don’t know anything about a specific deadline at UCSD for receiving SAT scores as my son did not apply there. “No later than January” could mean (to me) 1/1 or 1/31. You should call their AO and ask.
Did you pay collegeboard to send your scores? Did you also pay for rush delivery (1-2 business days)? If you used a ‘free’ score report, it will take collegeboard 10 business days to send the report.