Instead of bringing a parcel to your address, they provide a Delivery Notice / Avis de livraison. It announces that because you were not home [even if you were], you must pick up the parcel at their convenient parcel depot, tomorrow.
And, of course, the depot had our parcel on the day they delivered the notice. No 24 hour waiting period needed.
It appears Canada Post charges for carrying parcels to a specific address but does not actually take the deliverables beyond the depot. Door to door service means: Come to our door for service.