In the browser, copy & paste edge://settings/help and click Enter and you will see below:
If the About page shows Microsoft Edge is up to date., you don't need to do anything.
If the About page shows An update is available., select Download and install to proceed. Microsoft Edge will download the update an apply it the next time you restart Microsoft Edge.
If the About page shows To finish updating, restart Microsoft Edge., select Restart. The update is already downloaded and all you need to do is restart the browser for it to be applied.
Fore more info, click on this link here: Microsoft Edge update settings