Visit the teacher at his home.

What you want to ask is "what should I say when I visit the teacher in advance?" This matter can be said as follows:

"Hello, teacher, I'm XXX. I originally planned to visit your home at XX time, but my schedule has been adjusted, so I want to ask you if it is convenient for me to visit your home at XX time in advance. I look forward to your reply and wish you a smooth work and good health! "

This statement not only expresses his desire to visit in advance, but also respects the teacher's schedule.