However, I would not buy the kit, but only the body and the RF-EF adapter with the polarising filter insert. I have never needed the SRF 18-150mm, but use my existing EF lenses and can always insert the small polarising filter in the adapter for all lenses.
You don't have to carry 2 lenses because it can zoom from wide angle to 150mm. I have already taken great photos with this kit. Unfortunately, we can't set the aperture much the way we want.