The GTX 1080 Ti is still a very capable graphics card, and should be able to handle the 32" G5 Odyssey Gaming Monitor with no issues for Microsoft Flight Simulator 2020. You should be able to run the game at 144Hz with high graphics settings, but you may need to lower the settings a bit to achieve 165Hz.
As for other monitor recommendations, I would suggest looking at monitors with a 1440p resolution and 144Hz refresh rate. Some popular options include the Dell S2719DGF and the ViewSonic XG270QG. These monitors should provide a good balance of performance and image quality, while also being compatible with your GTX 1080 Ti.