Reply To: How to show up the custom column in grouped meta

This is the code I used while the date where in string (before all the group madness) to retrieve the meta_key_value.
It echoes the value in a new column inside edit screen and also let me modify It using quick edit.
The problem is that it can't work with my actual configuration.
Anyway, here is my code:
https://pastebin.com/ZqvmHcye

And this is the code I use to generate metaboxes. I've added a couple of comments to try to explain what I would like to extract and being able to modify.
https://pastebin.com/4BgTUcRM

Do you think is there a way to rearrange old code to be compatible with the new one?
Thank you.