Generally speaking, fertilization when plants are getting ready to bloom is not encouraged since it can shorten the bloom time. I however would not be the least hesitant to ferilize with an organic fertilizer since the uptake of the nutrients from an organic fertilizer is not the same as that from a synthetic one.

The main question is why do you want to fertilize now? Did you not do it earlier? Compost, especially homemade compost or even compost tea made from it, should be fine at this point IMO.

I agree