marcinfilipiak

ReadTrack is a lightweight plugin that improves the user experience by displaying: 
– ⏱️ Estimated reading time based on post word count 
– 📊 A visual progress bar that fills as the reader scrolls
You can fully customize the text shown before the post using a settings page in the WordPress admin panel. The default template is:
<pre><code>⏱️ Estimated reading time: %minutes% min
</code></pre>
Simply place <code>%minutes%</code> in your message to dynamically show the calculated reading time.
New in version 1.2: 
– The plugin now uses the WordPress database (via <code>get_option()</code> / <code>update_option()</code>) instead of saving configuration to a file in the plugin folder. 
– This ensures full compatibility with WordPress.org guidelines and multisite installations.
<h3>License</h3>
This plugin is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License v2 or later.

ReadTrack

Adds a reading progress bar and an estimated reading time above each single post.

nigauri

This plugin to insert “Estimated Reading Time” at the beginning of content.
<ul>
<li>Can choose “Minutes” or “Minutes and seconds”.</li>
<li>Can output in free format.</li>
<li>Can switch show/hide in Home, Front page, Post, and Page.</li>
<li>Support shortcode and tag.</li>
<li>If you want to translate this plugin, you put ‘.po’ and ‘.mo’ in ‘languages’ directory. Japanese language file is included in this plugin.</li>
</ul>

Insert Estimated Reading Time

This plugin to insert "Estimated Reading Time" at the beginning of content.

ReadTrack vs Insert Estimated Reading Time