Popcorn is usually extremely salty, hence the unhealthy.
All the centres I've worked in have asked parents to provide 2 pieces of fruit for a fruit salad for morning tea. We always had HEAPS of apples lol. It was rare that a child didn't eat any, probably because thier friends were. After Fruit we'd give them a snack from thier lunchbox as well, So not a big deal if they didn't eat thier fruit. Afternoon tea was fruit and anything left from lunch was offered.
What you've planned sounds like plenty. It should be kept in the fridge so anything uneaten should be fine for the next day.