SADEED said:I think you must tell them at this stage and they will ask you for all the additional docs/fee which is a must for processing, first the application and then the PRF......
or if you have any financial constraints then I think the only option you have is to show/register your marriage on the later date may be after you receive your passport stamped.....do discuss with your wife also if she will be ready to wait that much in case you have to do your landing.......
I think if financial is not an issue then its better to update them right now and don't pay the fee. And please hurry up before the ECAS shows decision is made..
Good luck....
His PR visa will be invalidated if he doesn't show his wife as dependant in the application before landing.