FWIW, I don't really do that. Sometimes I write the comments as I go; there is almost always a pass I make at the end as I'm preparing the material for review where I revise the existing comments and add missing ones.

I mention this because I think it's great that the commenting style works with both our workflows and doesn't really imply rigid adherence to either one of them. I suspect we would find it comfortable to maintain each others' code despite the divergence in approach.