Assuming the standard Oly plate color/weight scheme.... The big whites are 5 kg each, the little green change plates are 1 kg each, the white change plates are 0.5 kg each. So 13 kg in added weight.
They don't look like standard Oly collars, which are 2.5 kg each, so who knows. I'll call them 1 kg each for easy math.
He's probably using a women's Oly bar, it looks skinny, which is 15 kg.
My guess then is 30 kgs, so 66 lbs.
Pretty nice form though from that young man!!!