There is no state law in Pennsylvania that provides for early voting.
But the Democrat Party and some judges have gone rogue.
That which is not forbidden is MANDATORY!
I think you can actually go to the voting service center in your county and do mail in voting in person. Meaning you go and apply for a mail in ballot, they process immediately and hand you the ballot and then up you complete it and seal it like you do a mail in ballot but all at the same time. I believe that is legal.