The Giants have yet to make the official announcement but there's a picture of Coach V on the website and an article about the "near deal" in place.
Also, MLBTR has a confirmation from Tennessee AD Danny White that Vitello is leaving.
Amateur teams are not run by managers but rather by (head) coaches. Only professional teams have managers. Tony Vitello's entire baseball experience, from player to head coach, has taken place in the amateur realm. This is very unusual in MLB circles. Most managers come with professional experience of some kind.