Is this enough food for a 15 month old?

My son is going to his nans for the day tomorrow so I’m packing his food and I’m getting worried it’s not enough

It’s 7:30-4:30

Breakfast- weatabix

Snack- banana

Lunch- cheese sandwich, berries, tuna

Snack- fruit bar, a pouch yogurt thing

Extras- puffs, bell peppers (which he won’t eat if I’m being honest lol)

He will probably have a cup or 2 of milk too as he is a milk monster lol.

Is this enough? He’s not a good eater tbh but I just worry. Tried to only give him things he eats lol