macOS Finder uses a live file system event model — it should update automatically. Manual refresh is only needed for network drives or stuck icons.
If you are waiting for an urgent email, the standard browser hotkeys will not work inside the standalone Mail app. mac refresh shortcut key
If you frequently switch between Windows and Mac environments, you can change your system settings to make the key act as a native refresh button. Follow these steps to customize the shortcut natively: google chrome - How to refresh the browser on macOS? macOS Finder uses a live file system event