get status of reactive

I would like to know if a reactive is already executed without triggering execution.
I have a button that is associated with executing reactives in other areas of the dashboard that haven't been executed. The purpose of this that the user can go and get a coffee while shiny is working on the more time-consuming stuff. Now, I would like the user to be able to select different heavy tasks that he/she wants to have executed. To do so I want to collect all reactives (ls(envir=globalen()) is "reactiveExpr") and then figure out which state it is in. (I don't want to show all reactives that have already been executed...)
I haven't found a way to query the state of a reactive... How would you do this?

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