When to plant 40 perennials?

I went to Costco today to purchase only to purchase meat.  Either
fortunately or unfortunately, their perennials had just arrived.  I bought
12 boxes of assorted perennials-4-6 plants per box at less than $7 per box.
I checked all of the boxes and the roots look healthy and most have started
to send up growth (white for lack of light).  I bought Christmas ferns,
leatherwood ferns, 2 kinds of hosta, siberian iris, columbine, aruncus,
heuchera.  The big question is when can I put these in the ground?  They are
in peat moss sealed in plastic bags.  I am on the East End of Long Island in
Zone 7 - although I consider it as zone 6 since I am so close to NY and CT.
It has been such mild winter - the ground never froze, it is really tempting
to do it soon.

Thanks for any advice.
Margot Kane
Zone 7

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