Polling locations across the US will close late into the evening , but final results for several key states will rely on the arrival of mail-in ballots. In several states, mail-in ballot deadlines are days after election day, as long as the ballots have been postmarked on time – pushing the official results to later this week. Though this is both normal and legal, the thought of a delayed election result has a lot of people anxious.
The Guardian put together a comprehensive timeline of mail-in ballot deadlines to chart out the final count.
Source: US Politics - theguardian.com