I just went to find your article again and was about to say that Pyxis would say to go ahead and make one now.
https://www.backyardchickens.com/articles/guide-to-assisted-hatching-for-all-poultry.72886/
Yep, I would say that

I use a small screw or drill bit and just twist it back and forth gently until a small hole is formed.