Need a bit of advice and/or input, I'm going into VR and buying a headset, but am unsure if I need to upgrade my CPU at the same time. The rest of my parts are overkill as they are, and I figure it couldn't hurt, but don't know how specced out I should be to enjoy VR to the fullest extent. 
Currently, I have an i5 9600KF which is what I'm considering upgrading, and I'm thinking of getting the Index as per the rentry guide. Any opinions?