The endgame with just those 6 pieces is pretty rare, so I doubt there would be enough games in any database to make good stats. Just judging from the material imbalance though, White is in no danger of losing (unless he blunders his Rook).
Without any blunders, White just has to make sure Black cannot sacrifice his Queen for White's Rook and one minor piece (since K+B vs K is a draw). Then, White can maneuver his pieces and set up one trap after another (pins and forks against the Black King and Queen) until eventually winning the Queen.
The problem Black faces is that he has to watch out for tactics from all 3 of White's pieces, which just so happen to move in all different directions (Rook = vertical, Bishop = diagonal, Knight = L-shape). Meanwhile, Black can only really attack with his Queen, and the Queen alone is not enough to cause serious tactical threats (White just has to watch out for skewers and a few pins from one piece).