December 23rd, the certified EC results from each state need to arrive in DC. By January 3rd, the newly assembled Congress needs to be presented certification that the results are in. January 6th, there's a joint session of Congress presided over by the VP, where representatives of each state's electoral college report that state's results, to be accepted or challenged by Congress. Anything challenged triggers a highly constrained and time-limited debate followed by a quick vote, and if either house of Congress rejects the challenge, the votes are accepted. Once a single ticket accrues 270 accepted electoral votes, the Vice President is supposed to announce that ticket the winner, thus closing the special joint session of Congress.

This is likely what the other poster was referring to as the end of the election.

Personally, because I'm jaded and skeptical and have seen too many damned shenanigans from the GOP trying to steal the Presidency, I'm not going to believe this thing is over until January 20th, 2021, at noon, when Trump magically returns to "private citizen" status and Biden becomes President.