To answer you in a very literal sense, GTP-3 is currently powering GitHub Copilot. It’s an actual launched product for $10/month. That’s going be booster rockets for the on-ramp to becoming a coder, and there is evidence it can help all coders be more productive.

https://github.blog/2022-07-14-research-how-github-copilot-h...

As to what else future language models could power, based on my own use, I think fine tuned future language models could probably handle most customer support, accelerate the creation of most web content, accelerate quite a bit of paralegal grunt work, and power highly interactive game NPCs like in AI dungeon, another launched and paid product based on GTP-3.