1. OSHA/ETS. Tried in Circuits Courts of appeal. The ETS went into effect immediately, and is not "shut down./ Note, th ETS is shut down. That's Emergency temporary standard. Those only have a life of 6 months no matter what.
2. OSHA, not ETS but "regular standard" or "regular rule." Tried in District Courts. Why no cases yet? because the regular rule isn't in effect yet. The notice in the Federal register laid out a timeline for comment and a date the regular rule would be effective.
The "OSHA, not ETS" activity is still very much alive. Most companies 100+ employees will act as though implementation is inevitable. They may not like it, but it's the easier of two difficult choices.
I would not want to be guilty of wishful thinking but anybody sane would see the writing on the wall that the court will not support the ETS and therefore not support the “Regular Standard”
Of course we we are not dealing with sane people.