Had my interview today. Got a phone call while I was driving from Toronto to Detroit saying I could come in at any time and didn't have to wait for my specific appointment time.
There were no CBSA officers working in the Enrolment Centre today because of the Canada Day holiday.
My TTP dashboard now reflects that I'm a Canadian citizen, but my Netherlands passport is still listed as the document proving citizenship and allowing entry to the US. Hopefully this updates or I'll have to do a walk-in in Niagara.
Fingers crossed the card comes soon, and shows my citizenship as Canadian.