What should kids be able to do on there own when going to kindergarten?

What should kids be practicing at home to prepare for kindergarten on social & educational learning.

I'm super concerned about school Kindergarten seems like such a grown up thing going to the bathroom by themselves, going to class, going on school bus it's frightening I worry about did they make friends, did they eat lunch my main thing were they okay.

How do you moms let your kids go off to elementary its such a hard task!