It might take a while. Not sure how long you let it go.
Have you tried contacting that notebook’s author?
The last commit on that notebook was… " Latest commit 61a7bac Sep 12, 2022…"
Is this part running fine?
!pip install --upgrade openai
I vaguely remember a problem someone had with upgrading. You might want to search here in the forums too.
Also, you might want to check out what appears to be an official OpenAI notebook for fine-tuning…
Hope this helps.