At check-in, CM said nothing and asked nothing about the Canadian tickets. Just checked us in as usual, gave us the magic bands and we were good to go

We left our passports in the safe before heading to the parks, and we got in no problem just with a tap of the magic band, it was no different than any other time (sorry I'm assuming you have been to WDW before? )
Before our trip however I called Disney and asked this question and was told on the phone that if your Canadian Tickets were purchased as part of a PACKAGE with stay/and or dining then nothing needs to be done to redeem them other than check-in. She said if we purchased them separately, then yes we would have to first redeem them.
That's how it worked for us