Until the rule is in effect, and enforcement starts, there is no standing to sue.
Want to be a test case that will destroy your finances and take years of your company’s life away?
That is the game being played. High stakes chicken on a train track.
Technically, the principle you describe is "ripe," not "standing."
Standing in on WHO is damaged, not WHEN.
On law in general, cases before damage are common. Stop the Keystone pipeline, stop the order before it goes into effect, etc. - restraining orders in general are pre-effect.
The so-called law on the vaccine mandate cases will be whatever the judge's bias is. There are examples on both sides of the decision. This is a "rule of man" issue, not a rule of law issue. The judges will smugly hide behind rhetoric and claim "the law allows no other decision."