The earliest useful changes may be practical: knowing what lunch will be, measuring a serving confidently, having a snack ready and spending less time deciding what to eat.
Notice whether you are improvising fewer meals, whether the snack is available when you need it, and whether you can return to your next planned meal after a disrupted day. These observations help you improve the routine even when the scale is moving unevenly.
Feeling fuller or having fewer cravings can vary. Treat these as things to observe, not promises you must experience by a particular day.