I understand they are starting first about the citizens in other countries and also the 'divorce' settlement before discussing anything else. I found that rather odd but last week I went with a friend to see a French divorce lawyer - and interestingly he told her that at the first meeting in court with the judge the divorce would be granted and only after that would things like the disposal of property be decided at future meetings - so maybe Brexit will follow similarly.
Barnier and the Davis will only meet once a week I think - presumably the Civil Servants will be ha,merging out things in the meantime.