As an engineer doing APIs for a company that is involved in online retail, and having built shipping integrations and exported this sort of data in APIs...

This is a pretty good schema.

I was expecting something a little more naive, but there are concepts in here that I believe would let us expose everything important to Google about our shipping options. Enough to let them compute an accurate price, time, and label, at any given point in time.

Things like the cut-off time, and being able to represent which days/hours your warehouses are open is really important in this sort of thing.