These appear as a bubble next to your username and its color changes based on when the update was released. While you can manually check for updates by clicking on the three-dot menu, opening Settings and then going to About Chrome, Google also uses a color-coded warning system to let you know when new updates for its browser are available. Just like with the recent zero-day flaws patched by Apple, the most important thing you can do to stay safe in this situation is to update Chrome to the latest version as soon as the update arrives in your browser.