Hi,
I believe PGWP can't be extended unless they initially didn't give your full alloted time maybe cause of passport expiry otherwise you can't extend/renew pgwp.
I think maybe, you either wait till you get AOR to apply for OWP which will give you maintained status until it's approved. OR You can apply for a visitor record now before you work permit expires so you actually have no gaps in ur statuses afterwards can apply for OWP when AOR comes. I would lean towards the latter option so I don't have an expired status. Chances are you will be probably get AOR within two weeks.