In certain cases it's correct, like this one. When you want a confirmation of something, you'd repeat something you think is true, and ask it like a question, like here. If the speaker didn't know when 'dere' were coming, they might ask "Kommer dere i morgen?"
I wouldn't say it's common in either speech or writing, nor do I see why you shouldn't be allowed to use it in writing.
I have a feeling that "do you also come tomorrow" should be accepted.