I recently got (and recommend) the Gigabyte M32U, a 32" 4K 144Hz monitor w/ adaptive refresh. With the 2021 Mac Pro it's plug-and-play, super smooth @144Hz. You

I recently got (and recommend) the Gigabyte M32U, a 32" 4K 144Hz monitor w/ adaptive refresh. With the 2021 Mac Pro it's plug-and-play, super smooth @144Hz. You connect your Mac via a single USB-C cable, and the monitor has a built-in KVM/hub for peripherals (sent via the same USB-C). The USB-C port also charges your Mac at 18W while the monitor is on, and charges faster when the monitor is sleeping. It's somewhat pricy but is apparently considered budget for a 32" 4K, recently on sale for $600. The monitor wakes from sleep exactly as suggested. Even when the Mac is closed, you can move the mouse/keyboard connected to the KVM to awaken it. (However if the KVM is switched away from the Mac, as expected it won't auto-switch back when the Mac is awakened.) IMO the monitor looks fantastic, but it's IPS so doesn't have as-good-as-possible blacks/contrast/HDR. There is also some backlight bleed visible in a dark room (apparently typical on large IPS monitors).