Ask a courier and the delivery was a success: it left the depot, it was scanned at the door, the tracking says delivered. Ask the plant and it was a disaster: it was dropped at 4pm on a Friday behind a wheelie bin, the household was away for the weekend, and by Monday it had cooked in a sun-trap porch or drowned in a plastic sleeve. Nothing went wrong in the ordinary sense. It simply arrived at the worst possible moment.
That gap between on time and in time is the whole problem of timing a living delivery. A book can wait a fortnight on a doormat. A plant goes on respiring and losing water the entire time it sits unopened, living off its own reserves. Every extra hour on the step is drawn from a battery that started draining the moment it was lifted from the bench, and a weekend is a very long time to a plant in a box.
So the timing decision is not an afterthought bolted onto dispatch. It is dispatch. When a plant leaves determines when it lands, and when it lands determines whether a living thing meets an open door or an empty house. Get the day right and the journey is uneventful. Get it wrong and the healthiest plant, packed perfectly, still arrives as a complaint.