When you see this at the upper-right corner of your Chrome browser that means there are updates available.
These updates could be security or feature updates. Just click to start the update process.
However, if you do apply, Chrome will shut down and reopen. So, if you’re in the middle of something, you may wish to wait.
Chrome will automatically apply updates after you shut and reopen it, anyway. So, you can wait if it’s more convenient.