Bestony

You can get a New Button On your TinyMCE Editor to add Your Update Signature in your post or page.
Plugin Support 
* TinyMCE Support 
* QuickTag Support

Insert Update Time

You can get a New Button On your TinyMCE Editor to add Your Update Signature in your post or page.

Andrew Ozz

This plugin is intended for more advanced users that would like to change the default TinyMCE configuration in WordPress. 
It makes it very easy to add, remove or change all TinyMCE settings for the classic editor and for the classic block in the block editor.

Advanced TinyMCE Configuration

Set advanced TinyMCE options for the classic block and classic editor.

Insert Update Time vs Advanced TinyMCE Configuration