This study aims to determine whether morning versus afternoon treatment impacts efficacy of (standard of care) immunotherapy in a broad patient population. Patients with any type of advanced/metastatic malignancy are eligible to enroll in this study, as long as first-line anti-PD-1/PD-L1 immunotherapy is on label for their condition. Participants will then be randomized to either the early treatment group (administration must start and conclude by 11:00 AM +1 hour window) or the late treatment group (administration must start after 12:00 PM).