AleksHr

If you don’t check your admin panel very often when installing WordPress (perhaps because you prefer to use remote publishing) or want to make sure 
that your clients ‘ WordPress installations are updated, then this plugin is for you. You don’t need to regularly log in to your admin panel, 
subscribe to an RSS feed, or do anything other than install this plugin to receive notifications when WordPress updates, plugins, and themes are released to Telegram messenger.
All you have to do is install the telegram Update Notifier and forget about it until you get a message about the required updates.
To change the Update Notifier Telegram settings, go to the Update Notifier Telegram section in the main settings menu. From there, you can add a unique telegram ID 
that you need to get by writing to the Telegram bot (https://t.me/update_notifier_telegram_bot) . You can also activate update notifications for themes and plugins.

Update Notifier Telegram

Sends notifications to the administrator in Telegram if a new version of WordPress is available. You can also send notifications about available plugi …

Scott Reilly

This plugin removes the WordPress update nag that appears at the top of all admin pages when a new version of WordPress is released.
Tired of WordPress nagging you about a new release? Maybe you already know about it and want to hold off on an update and would rather not see the update nag on every admin page you visit. Activate this plugin and be bothered no more!
The status of your version of WordPress (be it current or out-of-date) is still reflected in the footer of your admin pages and in the update count link in the admin bar.
And certainly, of course, I don’t advocate completely ignoring the fact that updates often contain fixes for critical bugs or exploits. However, there are various other means of learning about updates; and once known, not everyone is able or willing to update immediately.
Links: <a href="https://coffee2code.com/wp-plugins/no-update-nag" rel="nofollow ugc">Plugin Homepage</a> | <a href="https://wordpress.org/plugins/no-update-nag/" rel="ugc">Plugin Directory Page</a> | <a href="https://github.com/coffee2code/no-update-nag/" rel="nofollow ugc">GitHub</a> | <a href="https://coffee2code.com" rel="nofollow ugc">Author Homepage</a>

No Update Nag

does what it says on the tin

Removes the WordPress update nag that appears at the top of all admin pages when a new version of WordPress is released.

Update Notifier Telegram vs No Update Nag