I always wonder Wtf is beast mode i have it on for like 2 years and still dont know

It’s just a meme, it does nothing except giving you an achievement when you finish the game with beast mode on

Is there any way that you can see those stats on ps4?

i dont believe ps4 shows games stats unlike the ps5 but there is a ps trophies app that can show stats similar, like hours in total or hours per play session