Chromium team seems internally got the tab groups feature working and one employee working on the feature added the attachment containing the picture in Tab groups bug itself by saying its “alive”, seems he is excited too, like us.
You and most, don’t know how Chrome’s tab grouping feature evolves in future, Google is still working on the feature and at the moment, we can see the options in the context menu to create and remove tab groups, the feature is not moving forward from there.
This is how tab groups in Chrome look like when it works

To organize tabs better in Chrome and to address tab overflow issue, Google has brought Tab groups to Chrome (available in flags page) and announced they’ll bring scrollable tab bar to the browser. Till now, after adding the flag to Canary version, the Chromium team added options in the tab context menu to add tabs to groups and also allows to remove them from existing groups, check the gif below.

Tab groups available for Mac, Windows, Linux and Chrome OS ( now works on Android too), has this description according to the flag: “allows users to organize tabs into visually distinct groups”. Google in official issue thread posted the screenshot with three tab groups created.
What’s coming next?
Upcoming changes make tab groups to sync and persist (saved to disk) even when you restart the browser and to allow users to manipulate groups via tab dragging and to offer a drop-down menu for the group. Meanwhile, the Chromium team is also looking to ensure tab groups are always contiguous, and also able to interact with extensions.