Revenons à nos moutons : literally: let’s get back to our sheep:
The nearest English translations: To get back to business, back to the nitty-gritty, back to the subject, back to what we were discussing.
Taken from: Don’t toss Granny in the Begonias: Faut pas pousser Mémé dans les Bégonias. Par Marie-Hélène Claudel-Gilly et Primrose Arnander.