Alexandru Negoita

A plugin that adds the reading time and the reading progress to single posts, pages or both of them.
At this moment, there is no support for custom post types. It will be added at a later time.
The information box shows a progress bar, which will complete once you scroll the content.
Going back up, it will empty the progress bar.
It also calculates and shows the total reading time for the page/post.
You can change the bar colors and add the bar to the top, bottom, left or right side of the screen .
The default location is static, before the content and then floated, once the scroll view passes the box location.
You can also choose if you want to show the total reading time, only the progress, or both and if you want to show it on posts only, pages only, or on both of them.
Options page is found as a sub-menu link in Settings area.
It can be used as it is, or can be easily modified with CSS from your theme or other plugins. 
It will inherit the fonts and most of the spacing directly for your theme.
Optionally, the settings can be removed from the database, once the plugin uninstalls.
<h3>Requirements</h3>
It is build with the latest modern browsers in mind. It supports last 2 versions of Safari, Chrome, Firefox, Edge. It doesn’t support IE.

WP Post Reading Progress

Add time to read or progress bar to your posts and pages!

Joeri van Veen

The reading progress bar is a great user experience on longreads. Especially if it accurately depicts the reading progress in the article text, and nothing else. This is standard on single blog posts and enabled by default.
Customization:
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Location top of screen, bottom of screen or below a sticky menu.
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Choose color of the reading progress bar.
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Have the bar start at 0% even when part of the article is visible.
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Select post types you wish the bar to appear, or individual posts.
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Behaviour:
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The reading progress bar has smooth initializing since part of the text may already be visible, after that a lightweight update-function ensures quick response while scrolling.
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The bar can attach itself to any (sticky) element that you define as an admin, when there are multiple, the first visible element will be used.
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When there is no (longer a) visible element to attach to, the bar displays at the top.
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If there is no single article identified (by class names or id) it uses the whole page to calculate progress.
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Estimated reading time (beta)
Since 1.6.0 this plugin has rudimentary estimated reading time functionality, for when your theme does not support it out of the box. 
There are some potential issues, some of which cannot be fixed in a plugin. If it does not work for you, switch it off. It will have no effect on the plugin then.
This is my 6th WordPress plugin but my first one freely available to everybody. I hope you enjoy using it as much as I enjoy building it!
Regards, 
Joeri

WP Reading Progress

Light weight fully customizable reading progress bar. Sticks to top, bottom or sticky menu, with fallback for small screens. Includes ert (beta).

WP Post Reading Progress vs WP Reading Progress