The Final Fantasy XIV Endwalker Official Benchmark uses actual maps and playable characters to assign a score to your PC and rate its performance including scene loading times.
The benchmark gives an overall load time as well as loading times by scene.
WD's Black SN770M does well enough in the Final Fantasy XIV Endwalker Official Benchmark. It doesn't top any of the scene load times, indeed for scene 1 it's very nearly the slowest drive, but it still manages to end up in the top 10 drives we tested with this benchmark.