Subitem automation for every time period if status is something notify someone

The only automation that comes close to what I need for notifying my team is the one seen in this uploaded file.

When will we have the ability to select a subitem status column in this automation? Or is there something already available that will notify a person if a subitem has been assigned to them but they have not changed the status to show that they have begun working on it after a certain time period? Ex. 1 day after being assigned task.