I'm doing an OWP jointly with my PR.If you apply with OWP, it makes you implied status. But if you are applying only PR, you will be out of status. I personally recommend you to apply visitor visa although you apply for OWP as well because I saw many people got their document back. If your PR and OWP documents are returned after August 2nd, you will be out of status at that time.
Thanks for the advice. I considering maybe returning home to the UK and then returning on an ETA before sending the forms then.