I opened App Store, selected the My Account button, navigated to the AVAILABLE UPDATES heading and found Telegram there. Yes, I had to install it even though it is mostly inaccessible, to export my chat history to Beeper. Anyway, so it did appear among the apps that had available updates, and I selected the Update button, but then it was nowhere to be found in three seconds or so. Not even under the RECENTLY UPDATED heading. And no download progress indicator whatsoever!