My prediction is that non-very overweight people should make it to bodyweight trap bar deadlifts with maybe 1 or 2 stalls on the way before hitting a wall. Young underweight males who start eating more calories will make it significantly farther.

Bodyweight is around where people start to stall on squats in SS when they don't have their diet on track. Most people can lift a little more with the trap bar than in squats.

Upper body is a bit harder to judge, some people struggle quite a bit, others make fairly steady progress (including some women).