I’m currently finishing off grading a HDR project, I’ll do a writeup when I am done.
I have created HDR workflows for Resolve and Nucoda that work fairly well. Ideally you will want a HDR screen for monitoring, but it isn’t strictly necessary.

The comments above miss some key details. HDR for video and projection is not the same as what people refer to as HDR for photography. For televisions and projectors it is all about the colour detail, range, and light output, and controlling it.

So the new TVs and projectors have staggeringly bright light outputs, so you can display scenes with a light output range not previously possible. This lets you put out enough light to make you wince, so if the sun was in scene for example, instead of just being a white circle on screen as it is on a standard TV, it would blow out to nearly painful to look at levels, like in real life.
Also there is a turdload™ more detail in the colours, and reds are finally red.

Good HDR sets look incredible, they will be an easy sell once people see them, normal TVs alongside them look insipid and flat by comparison.

Grading is a challenge, but doable.