Reader Mode in Chrome browser is still available behind a flag and can be enabled in the stable version also, the latest update to Chrome Canary has added an always visible button in the address bar to activate reader mode for pages in the browser.
Somewhat unlike to Google, Chrome introduced Reader Mode in desktop Chrome. This was never coming, considering reader mode strips of all ads from page to make it reader-friendly, but it is here, still an experimental feature though. Behind the scenes, the feature uses DOM distiller to distill page contents.
To trigger reader mode for a page you’re on in Chrome browser, you need to click on Chrome menu and select “Toggle distilled page contents” option, this no longer required as a 3 horizontal line or hamburger icon has been added to address bar.
Unlike Edge and Firefox browsers that shows Reader View icon when readable content is detected on a web page, Chrome is always showing Reader mode button in the address bar, even on the new tab page.
Expect future updates to Canary to offer controls in reader mode to adjust the font size and change page background to light or dark or sepia.