Yes, you need to have your spouses PGWP in your application for a SOWP. It is one of the necessary documents to have your work permit approved.Do you need to submit the approved PGWP of your spouse while your OWP application is still processing? Been implied for a while and spouse just received the hardcopy.
I am in the same position as you, I uploaded my spouses PGWP yesterday as we only just received it. I applied for my work permit March 28th, with paystubs and letter of employment.