The 2 states that started early voting yesterday were
Kentucky - Mailed out ballots, and
Pennsylvania - Began in-person early voting
The two joined North Carolina which began mailing out ballots on September 4th.
And these 3 states have begun this process without the benefit of having a single presidential debate beforehand.
It should be noted that President Trump requested multiple times to have the debate schedule moved up, but his opponent and the debate commission both declined to accommodate his requests.