Others will comment as well I am sure but with your 10 days credit you should try to be back by 24/25 September and then stay for 2 years straight without leaving. There could be a chance you will get a secondary CBSA inspection based on your time away so be prepared to explain yourself if required. You could return after this date but then the longer you leave it your odds of being reported leading to PR being revoked increase so currently you are just border line given you can still meet the RO.
Assume you have a valid PR card with a validity through about OCT/NOV 2020 so that will probably help in entering the country. You will need the PR card to board a plane back to Canada else you will need a PRTD which will take time to get, probably beyond end of September.
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