Cook the ravioli according to package instructions. In the meantime, heat half of the oil in a large skillet, add grapes, thyme, and sauté until just softened 1 minute or so. Season with salt and pepper to taste.
Drain the pasta reserving ½ cup of cooking water. Add ravioli to the skillet with remaining oil, and toss gently to combine adding a few spoons of the cooking water to loosen the sauce if needed.
Divide ravioli among plates, sprinkle every portion with hazelnuts, and serve.