Not sure how accurate this is because The Athletic just counted the three-week break period that is given to players after the Euros but here are the supposed returning dates of the players:
Ampadu - July 17
Kovacic, Kante - July 19
Werner, Havertz, Rudiger - July 20
Batshuayi - July 23
Christensen - July 24
Azpi - July 27
Silva - July 31
Chilwell, Mount, James, Jorginho, Emerson - August 1
The Athletic also mentioned that the club are likely to make tailored arrangements with certain players, notably Chilwell and James who spent most of the Euros on the bench. Players can also return to Cobham early if they want to.