MIRI cooldown has passed the 15K “Pinch Point” in the cooldown process, and it is now down to 5.6K (~-450F), and if it stays there, it has successfully reached its operating temperature.
The temperature Plots button is a good visual tool:
https://webb.nasa.gov/content/webbLaunch/whereIsWebb.html
It’s a great link.
I’ve had it open in my browser since day 1 of this mission.
Fascinating telescope and deployment.