True , but next couple of weeks is going to be very slow due to holidays, if not stagnant. So my assumption is first week or second week of Jan. And I need to provide my PGWP atleast a week before joining.
But you can start working without the actual PGWP, usually, you just need to provide a copy of the PGWP submission letter and maybe if they are not aware of the regulations you can point them to the CIC web page.