I am in the same position as yourself. My visitor's record will expire next month. I have a PR App in (received AOR), and an OWP App as well (linked to account and is currently in process).
I called IRCC about two weeks ago, explained the entire situation and the agent told me that I actually don't have to apply for a visitor's record extension because of my implied status. The agent did emphasize however that even if I get my OWP, that does not guarantee my re-entry into Canada if I leave the country before receiving permanent residence. There is always a risk in the case that your OWP is declined or returned of course. I have personally decided to go along with the recommendation of the IRCC agent.
Good Luck!