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Summertime is best, regardless what type of iris you have, after they've finished blooming. These articles may help you:

https://www.gardeningknowhow.com/ornamental/bulbs/iris/dividing-transplanting-iris.htm

and

https://www.gardeningknowhow.com/ornamental/bulbs/iris/

Check the growing conditions needed from the links below.
How much sunlight do they receive?
Is the soil well draining?
High nitrogen levels can cause lots of green leaves and inhibit flowering.

A soil test can help you determine if soil amendments are needed.
These articles will help you.
https://www.gardeningknowhow.com/ornamental/bulbs/iris/iris-plants-not-flowering.htm
https://www.gardeningknowhow.com/ornamental/flowers/camellia/caring-for-camellias.htm
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/too-much-nitrogen-soil.htm
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/bone-meal-fertilizer.htm

The weakened flower stems could be due to the transplant.
It can be sign of the plants needing to be divided though my research shows many gardeners list heavy rain and wet soil as conditions that also can cause this issue.

It certainly can be due to a weakened variety.
I have had a few complaints of this issue this spring and we suspect cool rainy weather may be a cause also.

Iris are typically planted 12 to 24 inches apart and 4 inches deep.

Day lilies were taking over our flower beds, and I digging them out, we also had to dig up some iris because the day lilies had encroached in them. My question, Can put the dug up iris in water until I can get the replanted tomorrow?

Yes, you can remove the spent flowers from the plants.

https://www.gardeningknowhow.com/ornamental/bulbs/iris/growing-japanese-iris-plants.htm