But can it be enforceable or is the Trump administration just going to kick it down the appeals court indefinitely?
I believe application has been made to the Supreme Court. As I understand the process, if the SC decides to review the appeal, then the current position is stayed. I.e. the tariffs continue until determined otherwise. If the SC decides not to review the matter, then around the middle of October the latest judgement would come into effect and the regime would be required to repay the tariffs with interest.*
Although some cases do seem to take an age before hearing and there is a growing list of cases to be heard by the SC, having an appeal before the SC isn't necessarily going to indefinitely kick the appeal down the road. They acted pretty quickly in the move to have orange rapist removed from the ballot in certain states and extremely quickly in the Albrego Garcia case. But what I don't know exactly what criteria they apply in deciding how quickly appeals should be heard.
* Given the regime has habitually ignored or sought to circumvent court orders in, for example, the Albrego Garcia case, having a court judgement does not necessarily mean the money would immediately be repaid. But American courts may be more inclined to award punitive damages where there has been a deprivation of money, as opposed to liberty.