Since the official Telegram clients are open source and the org encourages open competition between third party clients, it's now possible to build a Slack-like experience with workspaces, folders, integrations, and hot keys. Telefuel.com is one example.
As Telegram launches their $1.7bn blockchain by eoy, it'll be interesting to see how they develop their crypto-economy. There seems to be a bit of development activity in various Telegram groups, but there's still a cloud of secrecy about the whole thing.
Disclosure - I cofounded Telefuel.