I think that we will soon see Telegram rewarding people for using Telegram with their own coins,
so sadly I must say that I dont see any bright future for this project.
Then again, I may be wrong....
Telegram had ICO and collected money in the end of 2017 - beginning 2018. But till now there is no telegram wallet and telegram reward.
Telegram collected a lot of money for the creation TON and it does not follows the roadmap. I think a wallet from Telegram will appear but nobody knows when.