I just plant out when the soil is warm enough, no matter what hight or flowering state I have. I get bags of tomatoes, so why worry about it.
I have noticed in garden literature the word 'requires' is often used for things that may be desirable but ar far from necessities. Indeed, if you were to pay heed to much advise, you'd decide growing simple plants was too tough and not bother. I am sure many beginners mus feel put-off by this wealth of negativity.