To find out how fast your WiFi connection is, check out our guide on how to test your WiFi speed. However, this is usually not very accurate, and it could take a long time, depending on your internet speed. You will see a countdown clock with the estimated time it will take to download the update in the window. It might take a while for the progress wheel to stop spinning as your computer searches for an update.

Wait for your Mac to check for available updates.If an update is available, you might see a red badge icon in the top-right corner of the gear icon. Next, select Software Update.This is the menu option with the gear icon.If an update is available, you might see a notification in the drop-down menu. Click the Apple logo in the top-left corner of your screen.Once the update is finished downloading, click Download and Restart. Wait for your computer to find the update and click Update Now. Then go to System Preferences > Software Update. To update your Mac, click the Apple logo in the top-left corner of your screen.

Apple mac security update 10.13.6