It may be tomorrow, or the day after that. It might have been last week. It’s up to you, really.
Actually, the word “day” is obsolete in this context. “Voting season” might be a better way to put it, and it’s changing democracy. Exactly how remains a mystery, however.
Yes, Election Day officially is Nov. 6, the first Tuesday after the first Monday in November. But that’s now more a deadline than an event.