Rainmeter is quite pretty, but the displays (skins) seem to only work on the desktop.
The author of the article has iStart on the menu bar, so the performance indicators are visible even when application windows are covering the desktop. The GNOME extension system-monitor-next[1], as mentioned in the article, is also similar.
Does anyone have recommendations for something similar on Windows?
Oh, there were a ton of these utils back in the days.
I can't vouch for any of them because I don't use them, but just a quick search for "cpu utilization hdd utilization in the taskbar" shows a lot of options, eg https://entropy6.com/xmeters/
LiteStep folks liked it. Personally I never bothered with it, because, well I could hear it, lol, but I do miss LiteStep dearly.
https://docs.rainmeter.net/manual/getting-started/