According to the release notes, the new Geforce 546.01 WHQL driver is a Game Ready driver for Call of Duty: Modern Warfare III, which launches into early access on November 2nd and to all other players on November 10th. It supports Nvidia DLSS 3 and Nvidia Reflex. Recently, Activision released the official PC system requirements for the game and it should run pretty well on most systems, with recommended being the Geforce GTX 1080 Ti or RTX 3060, combined with Intel Core i7-6700K or AMD Ryzen 5 1600K CPU and 16GB of RAM (32GB fo high-rez assets cache). You'll also need 149GB of SSD storage (78GB if COD HQ and Warzone are already installed).
In addition to Call of Duty: Modern Warfare III, the Geforce 546.01 WHQL driver also brings optimizations and DLSS support for Desynced, Jusant, and RoboCop: Rogue City.
Nvidia also fixed some issues including two in Halo Infinite, which include increased loading times with the previous driver and performance drop on Maxwell GPUs, issues with Windows Event Viewer, issue wiht G-Sync with LG C3 OLED TV, and performance reduction in Stable Diffusion.
You can find full release notes and download the new driver over at Nvidia's support page.