I would be doing it standing up.
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Cam bearings don't see reciprocating wear, they see rotational. It has been my experience that crank bearings see far more wear than cam bearings.
When I sell something and I want top dollar, I do NOT want it coming back to haunt me. I make the car as mechanically sound as I can just to protect myself from looking like a liar and a cheat.
The camshaft is probably fine. all the rocker arms are secure with no play. The engine idles and runs great.
I will change the oil and try another oil pressure gauge first.
Thanks!