It sounds like the tutorial is saying (a video link with a time stamp)
so this is what they should look like when they're all done. deal/till them cool completely
I am aware that the presenter waited until the bread cooled down to cut it. Although the "deal/till" part is not audible, so I rewrote the sentence as
so this is what they should look like when they're all done. Wait until them cooled down completely.
Is my version clear, grammatical, and idiomatic? In particular, do I use the correct form of "cool"?