Many of the SPS and LPS look gone. Soft corals look savable.
Technically if even one tiny polyp or piece of flesh survives, then the coral can grow back from that. You could always do the wait and see approach. If something gets completely covered in algae and you see no living flesh, then I would toss.
Honestly if it were me, I would toss every stark white thing that appears gone as I would rather get a new frag at that point.
Looks mostly dead, but some corals are known to come back from what looks like clean white skeleton. May be worth popping it in the back of the tank somewhere, on the off chance that something isn't quite done living. Don't expect much from anything that looks like clean skeleton, though- my condolences.
That said, I do see a few live things. Is that a cluster of very unhappy zoas? You've got a few live softies in there, I think, which I'm very impressed with.
Anything with flesh still on it, assuming the flesh doesn't slough off into goop at the slightest disturbance, is definitely still alive. Baby that stuff, and it has a chance.