I'm trying to build a script that can follow(-f) kubectl get pods see a realtime update when I make any changes/delete pods on Ubuntu server.

What could be the easiest/efficient way to do so?

You can just use

kubectl get pod <your pod name> -w

whenever any update/change/delete happen to the pod, you will see the update.

You can also use

watch -n 1 kubectl get  pod <your pod name>

This will continuously run kubectl get pod ... with 1 seconds interval. So, you will see latest state.