Borderlands 3 is doing extremely well for both developer Gearbox Software and publisher 2K, with the biggest Epic Games Store exclusive killing it in September.

According to SuperData's new worldwide earnings chart, Borderlands 3 was the second highest-grossing PC game of September, losing out to Dungeon Fighter Online. Borderlands 3 beat established money printers like League of Legends, World of Tanks, Fortnite, and Roblox.
There were 3.3 million copies of Borderlands 3 sold in digital versions in September 2019, so with each copy at $60 this means the game grossed $198 million in that 30-day period alone.
This doesn't count for physical versions of the game on both the consoles (Xbox One, PS4) and the PC -- this is just digital versions of Borderland 3, although we don't know the percentage split of digital copies of the game between the consoles and PC.
Borderlands 3 Benchmark Articles
I've benchmarked Borderlands 3 at 1080p, 1440p, and 4K and even the reaches of 8K at 7680 x 4320. Here's some links to those articles:
Borderlands 3 Benchmarked: TITAN RTX Can't Even Hit 4K 60FPS
Borderlands 3 Benchmarked at 8K: also eats up $2499 NVIDIA TITAN RTX