Depends on the person with autism. Although I will say that just because someone has a high IQ doesn't mean they will be more successful in life.
For example, I know several guys with autism who I would say are above average intelligence. One of them was incredibly good at coding and could pick it up really fast. The problem was that he has selective mutism, to the point where he doesn't talk to anybody at all, so as a result, he works a part time low paying job when he's capable of much more. The other guy looked like your stereotypical nerd who was also fairly bright, but was lazy. He's 32 years old, still lives with his mom and dad, and has a low paying internship.
I would say what is a better predictor of how successful someone with autism will become, is their ability to adapt to the neurotypical world, and perhaps some ambition as well. Although you do need at least some intelligence to be capable of that feat, so I would say as long as you're at least average intelligence. Someone who is clearly intellectually delayed might struggle with being independent.