Kubelet watches API Server for CronJob objects. When it's time for a Job to run, it runs the Pod directly.

Kube-scheduler watches API Server for CronJob objects, and this is why it's called kube-scheduler.

CronJob controller component creates a Pod and waits until it finishes to run.

CronJob controller component creates a Job. Then the Job controller creates a Pod and waits until it finishes to run.