As it stands I don't think you can communicate the change in status until they give you the nomination. Once they give you the nomination, you have to communicate that you are now married and present the certificate. The office will ask you for supporting documents for your spouse (passport, permits, education, etc). They may also re-evaluate your nomination using the spousal information to make sure as a couple, you meet the PNP requirement.
So I would suggest getting the spouse's documents in order so you can submit them early for a prompt review.