If you get married after the COPR, you cannot land until your marriage is reflected on the COPR.
If you get married, the COPR does not say married, and you land, you will never be permitted to sponsor your spouse.
Simple question, simple answer, asked by many people.
You can either get the COPR, land, and then go back and get married OR get married, inform IRCC, add your spouse, and then get the COPR issued.