Translation:It is already twelve o'clock. I would like to eat lunch.
Just guess how painful it is for Finns to be visiting a place where the breakfast is very light and 'lunch' gets eaten around afternoon :^) It's a good catch from the course team, also from my experience it's a real thing.
In Finland the dinner (päivällinen) time comes quite early too, could be around 17 (or 5 pm). After it there's still iltapala (supper) in the evening, maybe from 20 o'clock until late night.
Back when I was a kid, most people I knew ate dinner promptly at 5pm. But back then typical office hours were 8 to 4.
Now there is more flexibility, office hours have slid more towards 9 to 5, and kids have a looot more afternoon hobbies. At least the people I know eat around 6 or so. And of course you need an iltapala! :-)
(In some dialects, supper is just a synonym for dinner, though. And in some, dinner can be the meal eaten at lunchtime, if that is the hot meal of the day.)
I may well have somewhat outdated conceptions because I haven't lived with that kind of close family in a while. For me the dinner usually is around 4 to 6 because usually my hobbies begin after that and it's absolute pain to be there if you are hungry. Another reason tied with young(-ish) adults' situation is that many campus restaurants close around 5 so to get food you need to be on time.
And yes, I know about supper but I once had serious hard time when trying to translate iltapala and it was probably the closest I could think of. Can you come up with other or more accurate translations or should we introduce iltapala into English language? 8) (edit: for some reason "evening snack" just sounds so wrong to me)