Run a method after physics finish loading

Hi, I'm searching for a way to run code after the engine physics have fully finished loading. I'm currently having issues with simulating some rigidbodies as they spazz out when the scene loads in and setting them as kinematic and then manually turning it off seems to fix the issue, however this is not really a feasible solution. So i thought about turning the kinematic mode using a script, but I have no way to detect when the scene has finished loading. Is there some way to detect this?