Hi there,
Oh, i think i understand regarding your query. For those i have read in the global forum. Most of them suggest, if your in this kind of situation. You can land in Canada within the validity of your VISA stamped on passport. After completing the formalities, you should be able to provide them a residential address in Canada (relative or friend perhaps) so they can mail you your PR card which usually sent within 3months time.
You can leave Canada 1 or 2weeks time upon landing to return to your country to continue working. Don't have any issue on that. However, your relative or friend who will be receiving your PR card should courier it to you in your home country. Coz it is the only thing you can present to the immigration officer for re-entry and when you plan to move back to Canada for good.
Hope this helps