The app, "SnackPass", faces a similar issue. Coffee shops spend time fulfilling mobile orders, placed in advance to avoid waiting in line, resulting in a delay for in-person orders.
While I was unable to view the entire article (paywalled), I suspect that some kind of priority queue that weights an order's priority by the user's distance to the store may be useful to solve the waiting issue.
While I was unable to view the entire article (paywalled), I suspect that some kind of priority queue that weights an order's priority by the user's distance to the store may be useful to solve the waiting issue.