Finally I had time to go outdoors and test Verizon's 5G mmwave on the brand-new blue iPhone 12 Pro. Luckily I'm only like a block away from a 5G light post tower here in downtown San Diego. Speed was totally impressive 3278 Mbps down. Dang it consumed 4.6GB of data in just a few seconds.
However, it's definitely very spotty. Turning your body a little and it wouldn't get the speeds anymore. Screenshots attached.