Congratulations on blooms Arturo!
I am fascinated that you grow them inside all the way until they are budding. Do you have a green-house?
I pre-start mine inside under lights. But I don't have the space for them to get that large before planting. Mine usually come out of cold storage in mid-March and get planted outside mid-late May, with blooms starting in mid June for the earliest dahlias but many not blooming until August.
I hope you will take the time to post pictures - this time of year pictures of blooms are always exciting to see.