Is there an app I can use to automatically track screen time for each desktop on my MacBook?

I usually forget to start/stop time trackers when I'm working on different projects and tasks. So I think it would be better if there is an app that can automatically track my screen time on each desktop. That means I can create a separate desktop for each task, and when I switch to it, the time tracker would automatically start. When I switch to another desktop, or when I lock the screen, or when the computer sleeps, it should automatically stop the timer.