Children do not perceive time as adults, do not necessarily understand the meaning of lateness, and are not skilled at delaying gratification. Children love certainty, and in order to save long minutes of crying and complaining such as "But I want Dad to take me to kindergarten", agree in advance who is responsible for bringing the children to kindergarten and even update the children according to their age.
It's never too early to start: Teach children, no matter how old they are, that in the morning there is a fixed order of actions.