Election 2020 updates: Biden warns of 'dark winter,' pushes masks in pandemic plan

Biden's lead in Georgia grew overnight and now stands at 7,248 after several counties uploaded all or a portion of their military and overseas ballots and provisional ballots, including roughly 5,000 from Fulton County.

Biden now has 49.4% (2,461,455 votes) while Trump has 49.3% (2,454,207) as of 6:30 a.m. Saturday.

ABC News estimates that there are approximately 15,600 ballots that could still be counted, including overseas/military, provisional and any other outstanding absentee ballots.

This outstanding total doesn't include all counties' potential absentee ballot cures, but it does include 535 absentee by mail ballots from Gwinnett County that required a signature of cure. The total also includes and 965 provisional ballots that will be reviewed by the Gwinnett County Board of Voter Registrations and Elections to determine their eligibility to be tabulated.

Approximately 5,000 additional votes, including all or a portion of its provisional ballots and military/overseas ballots, also came from Fulton County overnight.

-ABC News' Soorin Kim

The former vice president took to the stage three nights after Election Day to again say his prospects for taking the White House look good.

"We don't have a final declaration of victory yet, but the numbers tell us it's clear," Biden said. "We are going to win this race."

No outlet has projected the election winner, but Biden leads in four critical battleground states yet to be called: Georgia, Nevada, Arizona and Pennsylvania. His lead has narrowed in Arizona Friday, but only grown in the other three. He leads by more than 20,000 votes in Nevada, Arizona and Pennsylvania.

Biden didn't step to the podium until nearly 11 p.m. Eastern time. Vice presidential nominee Kamala Harris joined Biden on stage, but did not give remarks as previously planned if the race had been called. The former vice president spoke from the stage in Wilmington that had been constructed for a possible victory speech on election night.

Biden highlighted his 74 million votes, a record in a presidential election, and claimed victories in Arizona and Pennsylvania, though ABC News has not projected those races.

"We're beating Donald Trump by over 4 million votes, and that’s a margin that is still growing as well," he said. "One of the things I'm especially proud of is how well we've done well across America."

He spoke to the frustration many Americans -- and maybe some in his camp -- are feeling watching the slow trickle of votes come in.

"I know watching these vote tallies on TV moves very slow, and as slow as it goes, it can be numbing," Biden said. "But never forget, the tallies aren’t just numbers. They represent votes and voters, men and women who exercised their fundamental right to have their voice heard."

The Democratic nominee also promised to address the COVID-19 pandemic "from Day 1," but added he's never been more optimistic about the future of the country. Biden said he would also speak to the country on Saturday.

Biden is set to address the nation Friday night, his campaign advised to ABC News. 

If there isn't a call on a projected winner in the presidential election, the candidate will likely speak to the fact that he is closing in on 270 electoral votes and leads in Georgia, Pennsylvania, Arizona and Nevada, the campaign said.

The time of his address has yet to be officially announced. 

Speaking with reporters in Wilmington Friday night, Biden ally and fellow Delawarean Sen. Chris Coons told reporters he's not expecting a call Friday night on key battleground Pennsylvania, but he remains confident Biden will increase his margin and be projected to win the state.

"We're getting to a point where, literally, everyone I'm talking to in Pennsylvania is saying ... there's nothing by which Donald Trump can reverse this, and Joe Biden's margin is simply going to keep growing," Coons said. "But there's not going to be some concrete -- a clear announcement tonight about Pennsylvania."

-ABC News' Molly Nagle

With Mariopa County releasing the totals of about 73,000 ballots, Biden is leading Arizona by 29,861 votes, with 49.6% of the vote compared to Trump's 48.7%.

About 171,000 ballots are outstanding statewide.

Arizona has 11 electoral votes.

-ABC News' Meg Cunningham