Yes, it’s important to let the freshly roasted beans rest. This gets those flavors imparted through the heat/combustion to outgas.
I usually roast the evening before and roast enough for a day or two. I let the roasted beans de-gas/rest overnight before grinding them. I carry a small handheld grinder and grind it just before brewing.
I’m no coffee snob. I usually drink your plain, old Yuban. I just like the history, the process, and of course the tastes of different beans. I like roasting when camping to add that rustic, outdoorsy feeling to my outdoor adventures. It’s like cooking in my cast iron when outdoors.