Vitamins with a meal. Protein shake enough?

I am starting to take one of those vitamin packs with one half of them in the morning and a different half in the evening. The AM one says take with your first meal, the pm one with your last meal. I sometimes don’t actually eat my main meal until 1-2 but I do drink a protein drink at about 10. Is that enough to be a “meal’” to take with these? I want to get good absorption. Thanks