Doo it. Lunch is a social construct. As long as you are eating healthy food and in appropriate amounts, Generally it is okay for you to listen to your body to tell you when to eat. Don't eat in unprohibited areas such as in math class or in business meetings. But other than that, The time is not very important
When you wake up and eat breakfast it at least 🕗 so you should wait before having your second meal most people eat breakfast between seven forty five and nine fifteen so waiting until your stomach rumbles would be at least noon and anything before quarter to noon is more like a late breakfast than a lunch.