“The chief condition on which, life, health and vigor depend on, is action. It is by action that an organism develops its faculties, increases its energy, and attains the fulfillment of its destiny.”
When do you know it is the right time to take action? I would argue that if you are thinking about whether it is the right time, that the right time has already passed.
A bias towards action is a bias towards ownership. If you have that ownership trait then you will have a bias towards action. If you don’t, then you can grow one. Just start taking action on the things that need to be done.