From the day you apply PGWP you can start working full time even after SIN is expired until a decision is made.My study permit and SIN expires on Dec 31, 2021. I did apply for an extension on study permit as I was not given +90 days. I'm planning to apply for PGWP as I get my grades next week and before my study permit expires. Can I start working with the SIN valid till Dec 31, 2021? As my PGWP application will be under process and I won't have an expiry date to update on my SIN. Any inputs?