Before you can apply the font, you need the actual files. Since Apple doesn't officially provide .ttf or .otf files for Android, you must use web-ready versions.
This is the most "authentic" experience, as it replaces the Roboto system font at the root level. ⚠️ Important Considerations how to download san francisco font on android
This is the safest method. It won't change your system settings, but it will change the font on your home screen and app drawer. Download it from the Play Store. Before you can apply the font, you need the actual files