Form Submission Progress — Post Edit

I’m currently creating a custom-post type plugin that occasionally handles large file uploads (post-edit backend), I have everything working fine but as expected there are some requests that take a very long time and I want to show the progress of the form submission at the top of the page whenever files are uploaded.

I have been studying the javascript that shows the spinner gif in the WP core files, and I figured I could just mimic the functionality used when WP shows the status message “Post Updated. #View Post” for displaying the progress but I’m not sure how to best do this from a plugin perspective i.e. actions/filters.

I have enabled session progress fields in my php.ini and have done basic tests to show my servers can handle tracking the progress but I’m looking for a real basic and clean solution for something like this.

Anyone able to help?