The right mounting time?

[Thriodien]

Hi, I'd like to ask your opinion if i could mount my phals now, i mean this part of the year, or should i wait until spring? Coz when i bought them i was told to wait but some of the leaves are starting to become thinner and i can't ever check the roots as they are potted in dark pots. I'm quite worried for them. They are going to be placed in a florarium so humidity will be no problem. What should i do, should i wait for spring even given these conditions?