Safari is included with your Mac.
Testing conducted by Apple in October 2020 using JetStream 2, MotionMark 1.1, and Speedometer 2.0 performance benchmarks. Tested on production 1.4GHz quad-core Intel Core i5-based 13-inch MacBook Pro systems with 8GB RAM, 256GB SSD, and prerelease macOS Big Sur, and Windows 10 Home, version 2004, running in Boot Camp. Method 1: Download and Install Safari on Windows using.exe file. As I said, this downloadable file is the last supported version and would not have the latest features or the security measures. Use this method only if you are a developer and wants to see how your project UI looks on the old version of Safari.
Apple no longer offers Safari updates for Windows. Safari 5.1.7 for Windows was the last version made for Windows, and it is now outdated.