Average height of a Japanese male is 5' 7" or 170.18cm, using a measure tool in a photo editing app, I got 390.8 pixels for the guy in the middle.
The Console itself roughly measures 108.2 pixels height and 70.7 pixels width.
Converting these numbers to cm and inches and then rounding to the second decimal point I got
PS5 = 18.6in/47.12cm Height 12.1in/30.8cm Width
All this could be completely wrong if the guy holding the console isn't 5' 7" though lol. I think its fairly close though so maybe 18 x 12?
edit: this doesn't account for focal lens stuff which I know nothing about so who tf knows lol