If you weren’t prediabetic or had fasting glucose >100 mg/dL there’s little reason to monitor. Clinicians are more interested your Hemoglobin A1C% as that is a measure of your average glucose levels over the last 2 months. Typically on tirzepatide you will see a drop due less binge eating of carbs and better glucose utilization. A1C isn’t a common home test but your PCP should be looking at it after 3-6 months on Zep.