Well, I would keep up a regular watering schedule and just wait and see. The dead leaves can be cut off later if new growth appears.

I think it depends on the species. My woods are full of native ferns that I can move with no problems. My son who lives in Paradise Pines has moved lots of them up to his garden. Al

Your tree ferns are Cyathea cooperi/Australian tree ferns. It is likely that you didn't get a large enough root ball when you moved them. Likely these are going to die, regardless of what you do/don't do now. This tree fern is easily available at mass market nurseries and are also fast growing, so easily replaced. A proper sized root ball for these would likely require a 4 foot diameter by 12 to 18 inches deep, and would have been best done in several steps over a couple of months to reduce transplant shock.

I used to have this Australian tree fern for years and it did extremely well.Every year at xmas season I decorated it with all red balls,and I also grew some Spanish moss on it.

Fast forward to a few years ago,we had an unusually cold winter,and I lost mine to the frost.

One thing I learned while I had it was to always wear long sleeves when working around it.That stuff on them makes you itch like crazy.
Kathi