Good question.
I can tell from my experience.
On 20July2017 i received a revert for my email asking my Visa Office and got the reply stating its Ottawa.
On21July2017 i got my PPR.
i m currently residing in Abu Dhabi.
From the above its understood, my entire application till the last step was processed in Ottawa and not in Abu Dhabi.
in my case just the stamping on the passport and issuance of COPR will be done in my LVO (i.e. Abu Dhabi).
So if all checks are finished, the above is the only process done in Abu Dhabi