Gauges with needles are generally are not that good for close monitoring of in this case engine coolant temperature. I never pay attention to these gauges if digital data is available other than in the case of the coolant temperature gauge to note the engine is cold, warm, or up to temperature.
You have Performance Pages which sure displays a "gauge" but also gives you the actual temperature.
In the case of your car I would have thought the radiator fans would have come on at some temperature lower, say 216F (which is when as best I could tell my 2018 Hellcat radiator fans came on), and these would work to keep the temperature from going higher. 'course, under high ambient temperatures the temperature could go higher but reach a point where it (should not) go any higher.
With another brand of car in 116F ambient temperature the coolant temperature reached 226F. The radiator fans were on high speed but it was just -- to state the obvious -- damned hot. However, at no time did the temperature go any higher. Some time later and closer to home I had a chance in very hot weather to experiment and while I could get the coolant to 226F but I could not make it go any higher.
It could be Dodge changed the fan stages a bit and the 2021s run a skosh hotter. Regardless, as long as the coolant temperature doesn't continue to climb and there are no signs of a coolant leak I'd offer the coolant temperature behavior is normal.
To state the obvious, the car is new to you. So keep an eye on the coolant level (all vital fluid levels) and give the car a walk around after parking it and before driving it. After you park it you are looking for any leak sign or in this case any odor of antifreeze which can be an early warning of a coolant leak. Before you drive it you are looking for leak sign. If cold you won't smell antifreeze of course but a green (or whatever color the antifreeze turns to when put into the engine) puddle of fluid under the car is leak sign for sure.
