Like Dev said, July 1st of this year is the date they will begin accepting transgender civilians into the service. I am in a group for trans people who are interested in joining the military, and it is led by some of the soldiers who were involved in helping build the policies that will be in place. The advice they are giving everyone currently is to get in shape, study for the ASVAB, get all of your documentation updated, and otherwise get all of your ducks in a row before 7/1. They do not advise speaking to a recruiter until 7/1.
You could enlist as male after 7/1. You could not currently and would have to wait until after your second training period is complete before you could start transitioning.