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!

iTux

Paperthin.de

This plugin indicates progress made on books.
Important: Your theme needs to support widgets to show the progressbar in the sidebar/widget area.
Major features in Progressbar (Edition for Readers) 0.6 include:
<ul>
<li>Added: Support for new WP 3.5 media library.</li>
</ul>
<h3>Special Thanks</h3>
A big thank you goes out to @plueschsarg, because she is as she is.
Special thanks to @bookexhibitionism, @methinksabout, @MortalBookshelf and @xCrini for their input during the development of this plugin.
Additional a big thanks to all the users, especially to @buchsaiten, @ichbinkreativ, @nina2null and @WhiteSences.

Progress Bar (Edition for Readers)

This plugin indicates progress made on books.

WP Post Reading Progress vs Progress Bar (Edition for Readers)