It’s info available for everyone. If you search it in the source code, you are able to find it.
But the Dutch CM notified the dev-team team again to consider the option to hide that information like they did in the past with the timers. In the past people could also see in the code when productions of their neighbors were gonna finish. And today that information isn’t available anymore.
Another great option for the dev-team to consider is making it in-game visible for everyone without the extension needed.