Some Philadelphia math
The AP currently has Harris leading with about 307,000 votes here in Philadelphia to Trump's 83,000 -- with about 56% of the expected vote in. With an estimated 306,000 expected vote remaining to be counted, that works out to an expected turnout of around 613,000 votes for either Harris or Trump. But in 2020, Joe Biden won 604,000 votes here to Trump's 133,000, for a total of around 737,000.
So Harris may be able to make up the deficits that Geoffrey wrote about earlier in places like Lackawanna (Scranton) if she can get more votes out of Philadelphia than Biden did. Given that the intensity of Democratic Get-Out-The-Vote operations here, especially relative to the COVID-19 election of 2020, that is certainly possible.