吃饭了吗等你煮呢

The literal translation is 'Have you eaten? waiting for you to cook.' This indicates an invitation between friends or loved ones for shared meal prep. '吃饭了吗 Have you eaten yet?' Is actually an idiomatic expression used by chinese for greeting people as westerner saying 'How are you'. Thus this whole phrase expresses closeness within interpersonal relationship where someone eagerly looking forward to spending time together through dining activities.