Bos taurus

Some background: I am a 4th year Zoology undergraduate, applying for a Masters with a focus in Dairy Cattle Nutrition at UC Davis. My current GPA is a 3.08. I know it isn't ideal, and may negatively impact grad school admissions. I worked 2-3 jobs at a time all through undergrad, and at times that may have cut into my classwork, but I feel that I learned a lot through my work experiences, and they were worth the time invested. I have been speaking with a professor at UC Davis regarding the possibility of joining his group in the fall; he is accepting students, and he gave me some current and graduated student contacts. I was told to follow up with them, get a sense for what the group is like, and if I'm still interested, we can discuss coming out for a visit. I am very interested in that particular group, but my academic coursework and performance has not come up in emailing him, and I'm uncertain if my low GPA is an issue I should raise before visiting. If so, how do I address it in a way that isn't awkward? "I'm interested in your group, and would like to come out for a visit...but you should know my GPA is lower than I would like". Any advice would be appreciated.