They are working on the stuff they are assigned to. If you need to know exactly what they do each minute of the day you could ask them directly. If there are cards they shouldn’t work, then find a better way to prioritize cards that engineers can pick up. Don’t waste other people’s time.

I also think that stand ups are a terrible idea. It feels like extreme micromanagement. With everyone using slack it’s silly to wait a day for this specific meeting to say what they’re blocked on or raise other issues.