Telegram has rolled out it desktop version dubbed Telegram Desktop 1.0. This is the first stable application of Telegram with User Interface. Its three versions are of material design.
This app also supports theme and users can sign up in Telegram Theme Channels. Apart from this its functionality is like usual apps, which includes syncing messenger, sticker, bots and support for other things.
If the users type text in mobile, they can go in desktop versions and send it, because app syncs all data typed by different versions.
Telegram has also made an app for Mac which is available at Mac store. It has Mac OS user Interface, however, Telegram says that desktop app is also for Mac.