The results of the elections are normally announced on the same day of the election. In the case of the 2020 elections, Election Day is November 3, so the results should be announced this day.
Even if the election is close, it can be called in the early morning hours the next day, as the 2020 election was. However, there are many factors in the 2020 election that may not allow it to be called on November 3.
One of those is that most people are voting by mail-in ballot because of the fears from Covid-19, so that may delay the calling of the election by days, weeks, or months.