Linkedin post date extractor as a bookmarketlet alert

I’d like to make a javascript bookmarklet for Chrome which generates the date of a linkedin.com post and creates an alert.

So the date of a post like this one from Bill Gates:
https://www.linkedin.com/posts/williamhgates_what-do-kangaroos-have-to-do-with-newborn-activity-7222643141433028611-LDNX/

I’ve used this website to find out it was posted on Fri, 26 Jul 2024
https://ollie-boyd.github.io/Linkedin-post-timestamp-extractor/

Is it possible to make the javascript that sits behind this webpage into a bookmarklet?
https://ollie-boyd.github.io/Linkedin-post-timestamp-extractor/extractor.js

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I’ve tried editing:

const linkedinURL= document.querySelector("#url").value;

to change #url to

window.location.protocol + "//" + window.location.hostname + window.location.pathname

And i tried changing the output to an alert()

I tried using javascript compression website to make it into a bookmarklet format