More Clarification: Filling out the form is not the same as submitting it to the Canadian Government. My cruise is 8/15, Seattle-Round trip. I've already downloaded the app, added all in my party with their passport and vaccine information. That way the only thing I have to do is hit the submit button when it's time (72 hrs prior to cruise start date or before we arrive in Victoria, BC) to do so. No messing around with the data input. Hope this helps your questions!
Here's a note I received from my Suite Conceire this week on the subject: A Friendly reminder for your Arrive CAN for Canada, please try to finish this and get your QR code ready in hand for your smooth check in process. You can do this by visiting ArriveCANhttps://arrivecan.cbsa-asfc.cloud-nuage.canada.ca/welcome 3 days prior to the cruise starts or before you arrive Canada, please see the attachment for your reference.