Well at the risk of repeating myself, we saw this every day with NO dramas back in 1989.
The Crew when talking to Airline Operations prior to arrival, ordered whatever they wanted, then went in to the Terminal on arrival, picked it up and paid for it (themselves), took it back to the Aircraft and ate it, with still plenty of time to complete their duties.
In fact they were always wanting to know why it took so long to turnround in Australia as compared to the USA.
Incidentally, the next time I see any Crew go for 12 hours without something to eat, will be the first time in 40 odd years.