Change the button on the a task, so it goes to "in progress", when you press it again, it changes to "complete"
On a task, you can complete a task at a click of a button. Why not change that button so it starts the task. One click changes the status to "in progress", when you press it again, it changes status to "complete"
As-is when you press the button, you complete the case, you need a in between step.