From The Philadelphia Inquirer -- 

City elections officials said they were working to count ballots around the clock, as planned.

“We are doing the canvass, we are not stopping for nobody,” said Omar Sabir, one of three city commissioners, who run elections. “We’re here, we’re counting. The count has not stopped.”

If anything, another elections official said, Philadelphia is ahead of schedule when it comes to tallying mail ballots.

The confusion may stem from national news organizations' unfamiliarity with election results reporting in Pennsylvania. Counties do not always update the state system as often as they update their own websites, and at 11:40 p.m. the state’s website showed only 74,132 votes for Biden and 32,414 for Trump out of Philadelphia.