If I was on this situation, I would marry now that my application is underway and add my spouse to my application if
1. I can raise the required POF
2. my spouse doesn't have any criminal or medical issues that can prevent both of us from getting PPRs.
Our CRS score doesn't change.
....
However if you wait till after you land, then you'd have to sponsor your spose after you've earned enough income IN Canada to be able to do so.
The only con to this is an extended application time but it sometimes even takes shorter than an a single applicant's normal processing time
and like Cansha said, it's easy to find these things online especially through this forum.
But 'cos I've been away from here for so long, I wanted to do something nice, so I searched for you. Here's a link that expressly answers your question. Good luck.
https://www.canada.ca/en/immigratio...-electronic-application-on-section-a11-2.html