What are you today

I think the question should be "How are you today?"
If it is really "What are you today?" I think the person in answer might be in play/parts acting; therefore, someone ask which charactors is in performing today.

您今天是什麼職業?

或

您今天是什麼?

您今天是什麼?

Do u mean "How are you today"?

How are you today 即是“你今天好吗？"