No, NOT "too" late. Question is still as valid today (July, 2020) as 3 years (or "3.5 years") ago
Apple is still producing the bezel known as being noticeably wide or "thick." Seems some have no concept of what a bezel is. So as "Allstarme450" commented, "
The dude is just looking for the size of the black area between the edge of the computer and where the actual pixels start. Can someone that owns one just measure that quick?" That should've been a fast, simple answer. Even "Maflynn" pointed (literally!) the bezel out with a graphic symbol.
Without spending time to go to an Apple store again and one-hour driving time (round trip, parking, going into the store) to take 2 minutes to simply measure a bezel, we'd just like to get an idea of what we'll be looking at on 5 iMac Pros everyday, relative to the 27-inch viewable area. So, once more, as "Allstar450" asked, would an iMac/iMac Pro user please measure the bezel and provide the results?