Cauliflower & Sprout woes :)

I built a very deep large raised bed which i am trying with leeks,caulis & sprouts.
I have already realised i put a few too many plants in a couple of which floundered dwarfed by others who are thriving.
I also know why i have white fly invaders as the leaves are pushing against the netting so they can be got at :(
Apart from white fly invaders who i am picking off & spraying (any tips).... i am most worried about my Cauliflowers (see pics)
Theyre all quite tall greenery wise but i am seeing no sign of a curd appearing at all...am i being too inpatient or have they somehow failed please.
They did go in quite late june 8th but as the garden centre were still selling the plants i thought i would give it a try.
Most grateful for any help.