mrssd

<ul>
<li>Send WooCommerce order status updates to Telegram </li>
<li>Without adding any delay in order checkouts</li>
<li>Send Products out of stock or Limited quantity notification</li>
<li>Support Telegram super group with different topic</li>
<li>Support for both direct Telegram Bot API and Google Apps Script integration for countries have limit access to Telegram APIs</li>
<li>Customizable message templates with dynamic placeholders</li>
<li>Configurable order status triggers</li>
<li>Test message functionality</li>
<li>Easy setup through WooCommerce settings</li>
</ul>

Order and Stock Notifications via Telegram Bot for WooCommerce

A lightweight plugin that sends WooCommerce order or stock updates to Telegram using a bot.

nikita.global

Create your own notification bot which will send emails to your dashboard users via telegram.
Sends all mails to telegram user via your own bot. 
No need in many other plugins as you can use any email notifications which will be redirected to telegram
<a href="https://nikita.global" rel="nofollow ugc">https://nikita.global/</a>
Your website should support https.
** Message Filters ** 
Currently can send mails as plaintext, files, subjects only and truncated message. 
You can extend this range using the filters – see source code.
This plugin makes HTTP-requests to 3rd party service <a href="https://core.telegram.org/api" rel="nofollow ugc">Telegram API</a> 
to send notifications.

NG-Mail2Telegram

very good!

Create your own notification bot which will send emails to your dashboard users via telegram.

Order and Stock Notifications via Telegram Bot for WooCommerce vs NG-Mail2Telegram