Hi ,
Officers at the airport usually don't issue PGWP to people in implied status. They'll tell you to wait for your application to be processed, and let you in as either a visitor if you study permit is still valid, or as a visitor, see below:
When you return to Canada:
https://www.cic.gc.ca/english/helpcentre/answer.asp?qnum=1309
- You may enter as a student if your study permit is still valid.
- If we approve your post-graduation work permit while you’re away, you may enter as a worker.
- If we’re still processing your post-graduation work permit, you may enter as a visitor, and you can work without a work permit until we make a decision on your application.
A border officer will have some questions for you when you arrive back in Canada. The officer may ask you for proof that you applied for a post-graduation work permit, such as a copy of your application or the fee payment receipt.
If the officer believes there is reason to refuse your re-entry, you won’t be able to enter Canada.