So far, RCP has been on the money with the compilation of their polling system. They have it as Biden +7.8.
RealClearPolitics - Election 2020 - Pennsylvania: Trump vs. Biden
RealClearPolitics - Election 2020 - Pennsylvania: Trump vs. Bidenwww.realclearpolitics.com
The last 2 polls have shown a trend towards Biden, They were done well into July. That could be the continued impact of his coronavirus response which continues to get worse.