I came across the TM Archives
It says that he has incarnated last year 2010...
The Magisterial Mission Has Arrived
According to Monjoronson, his entry will be low key and with no announcements. Late spring in 2010 has arrived and so has Monjoronson.
He is incarnated. That is, he is in the flesh as a mortal male of the realm as they are born, live, and die on Urantia. He will live with a selected family of his choosing to learn family life, culture, habits, work, diet - and so on. He will observe it and participate in it to mark the beginning of millennia on earth..
Our love and affection for our Magisterial Son will grow as we are all able to contact the reality of what is occurring before our very eyes this last month of the 2010 springtime. In spring hope blossoms eternally for the renewal it promises, and for Urantia, that renewal will be a reality. Many summers will come and go before we may see results, but he will be working the lines of communication to become known and accepted as most of us have already accepted Him and the promise of a new life and feeling for Urantia.
Share with me this prayer that he becomes as successful as he needs to be to bring us all into the era of Light and Life on Urantia. May God's will be done.
The Student's attention is directed to a web site dedicated to the Magisterial Mission and Monjoronson, the Paradise Magisterial Son and his messages of hope and preparation for our planet. Browsers are invited to participate in questions and comments on the new site.
Just thought this is interesting, i thought i remember reading he would just materialize as a fully grown human being.