Phenom 300, Citation XLS and Citation Latitude are unattended fleets. Challenger 350, Falcon 2000EX EASy and the Globals are attended fleets. The Challengers 650 (due to arrive in 2022) will also have cabin crew.
On unattended fleets, pilots usually explain to the passengers where they can find their food and what has been loaded for them. On some occasions they will also help serving food, it all depends on the circumstances.