The workflow instance of PlanDefinition

the Task Resource is considered as the instance of the ActivityDefinition Resource. Is there any Resource could used as the instance of PlanDefinition? For example, I define a workflow A use the PlanDefinition. I want track how many workflows A are there and what’s the status of each one, which step(action) is in progress and how long the steps take.

CarePlan is most typically the instantiation of an entire PlanDefinition. CarePlan.activity has an ability to capture some degree of status information. There’s no standard way to capture duration though.