The US citizen is probably well above the median human. There are many countries where the education system is abysmal, many people are stunted because of inadequate nutrition, etc.
That in raw IQ terms LLMs already beat the median human, American or otherwise, and have thus achieved some definitions of "AGI".
That doesn't mean they're capable of completing many human tasks, much less improving themselves, which is generally considered the bar for "real" AGI/super intelligence.