Habari za asubuhi = How is the morning NOT Good morning. Good morning = Asubuhi njema and the reply is the same Asubuhi njema. If the meaning was Habari za asubuhi the reply would have been 'nzuri' for example.

And for Good morning there is no need to use a question mark because Good morning is just a wish just like to say I wish you a good morning. It is not correct to translate Good morning as Habari za asubuhi?

Good morning = Asubuhi njema

I greet you by wishing you a good morning = Ninakusalimu kwa kukutakia asubuhi njema.