Official election results likely won't be known until highly-contested states have counted all of their mail-in ballots, yet President Trump continued to press for the final results to be known on Election Day.

During a rally in Dubuque, Iowa, this afternoon, Trump insisted that a winner of the presidential election should be known on the evening Nov. 3, falsely saying "that's the way it's been."

Trump's own 2016 election victory was called around 2:30 a.m. the morning after Election Day.

Deadlines for receiving mail-in ballots also extend past Nov. 3 in several states.

-ABC News' Terrance Smith and Justin Gomez

This year, in addition to the burning question of “Who will win?” people are almost as eager to know, “When will we know the results?”

To help answer that, FiveThirtyEight published a comprehensive guide to following the returns on election night, including when the polls close in each state and what time we might get semi-final results.

You can walk through election night hour by hour, using the forecast as a guide to get a better understanding of just how many electoral votes might be accounted for, including how many Trump and Biden can each expect to win.

Spoiler: Unless one of them has a really good night, it’s unlikely that either will hit 270 electoral votes on election night.

-Nathaniel Rakich, elections analyst at FiveThirtyEight

Former Democratic gubernatorial candidate Stacey Abrams joined Harris at her campaign event at Gwinnett County, Georgia, Sunday and warned the crowd about the potential for voter suppression.

In the highly contested 2018 governor's race, Abrams lost by less than 55,000 votes to Republican Brian Kemp, who was still working as Georgia's secretary of state. The election was stained by lawsuits and allegations of voter suppression.

Abrams said voter suppression in the state is "alive and well."

"We know that just because good is on the move doesn’t mean that bad has stopped working," she said.

Abrams told the crowd not to panic and to stay in line on Election Day in the face of possible voter intimidation.

“We're not going to panic when we see militias. We're not going to panic when people tell us that we're not going to win. We are going to work to make sure that victory is ours. Don't panic," she said.

Harris praised Abrams' work in the state to expanding voting rights.

"I'm so thankful to her for the work that she has been doing for years to fight for Georgian and the right to vote," she said.

-ABC News' Averi Harper

Biden and Harris will end their final night of campaigning with some superstar musical guests.

Lady Gaga and John Legend will join the Democratic candidates during the final part of their Pennsylvania tour on Monday, the Biden campaign announced.

Gaga will appear with the Bidens during their campaign stop in Pittsburgh. She also helped to close out Hillary Clinton’s final rally in Raleigh, North Carolina, four years ago.

Legend, a graduate of the University of Pennsylvania, will appear at a rally in Philadelphia Monday evening with Harris and her husband Doug Emhoff.

-ABC News' Molly Nagle