It will likely be days before the results in Pennsylvania are known. They haven’t even started counting.
People who vote early on Election Day tend to lean conservative. As a result, Pennsylvania will initially appear to be leaning heavily toward Trump before they start counting the afternoon and mail-in votes. Then, it will start to shift toward Biden. Trump knows this and will do whatever he can to stop the counting as soon as possible.
The concern is that Trump, being Trump, will prematurely declare victory Tuesday night when the numbers still seem to be in his favor and then try to claim that any further counting is somehow fraudulent, or that Democrats are trying to “steal the election,” possibly inciting civil unrest in the process.
Trump is a shit-stirrer by nature and he can always be counted on to take the most confrontational approach to any situation.
The only state that we are likely to have anything close to a total count from is Florida. If Biden manages to win Florida, the election will be over tomorrow night. Otherwise, it may be days before the winner is known.