A 58-year-old man with a 20-year history of controlled hypertension (on amlodipine) and type 2 diabetes mellitus (on metformin) presents for elective laparoscopic cholecystectomy. On pre-anesthetic evaluation, his blood pressure is 138/88 mmHg, heart rate 76 bpm, and blood glucose 145 mg/dL. Cardiac examination is normal, and he has no dyspnea on exertion. What is the most appropriate next step in management?