This could take up to 30 minutes for subagents to complete. So you go to the store, but the milk is already sold out. Walmart will ship you the milk if you pay the S&H. You drive back home and check the terminal. "Completed in 6m37s."

is the worst timeline. That's close though

Unfortunately you'd have to wire your entire kitchen in cameras, your scale needs to be smart and all of it needs to be sent / processed in real time to track consumption which means it will take a lot of compute power and a level of data mining that could be abused by anybody from enterprising break-and-entry crews to the police, and on top of that if it's done by a cloud provider it's probably gonna end up in a data lake for targeted advertising.