Kevin Hart Says Tom Brady Is Amazing But He Ain't Joe Montana YET

Kevin Hart has some advice for anyone ready to crown Tom Brady the greatest quarterback of all time ... please, please, PUMP YOUR BRAKES ... saying it's still too early to crown Brady's ass.

We got Hart out at Mr Chow and asked him if it's officially time to say Brady's the GOAT ... since he passed Peyton Manning up for most all-time victories by an NFL QB.

That's when KH -- a HUGE sports fan -- got serious ... saying it ain't cool to put Tom at the top while he's still taking snaps ... getting especially hesitant when Joe Montana's name was brought up.