Can you explain me male gametophyte development?And also tell if vegetative cell and generative cell are haploid or diploid

Pollen grains represent the highly reduced haploid male gametophyte generation in flowering plants, consisting of just two or three cells when released from the anthers. Their role is to deliver twin sperm cells to the embryo sac to undergo fusion with the egg and central cell.

You didn`t answer whether vegetative cell and generative cell are haploid or diploid.