Object grabbed event

I'm making my first experiences with the Oculus Rift S and Unity. At the moment I'm working on a little sandbox for myself to get familiar how everything works. I'm using the Unity XR Managment und XR Interaction Toolkit.

I would like to trigger some methods when a player has grabbed an object. I tried using OnSelectEnter Event of the XR Grab Interactible... but this event is triggered too soon. I need to know when the object is actually in the players hand. Has anyone a hint for me, what's the best way to do this?

Best,
Verdemis