I just put a reservation on 6/30/18 and no invite! I know it's unreasonable to expect an invite soon but I kept checking incessantly!
My uncle put his reservation in June 2017 and got the invitation to configure 6/28/18. He was going to transfer the reservation to me as he no longer wants to get the Model 3 but been reading online and transferring the name and all might make getting the tax rebate difficult, which is why I decided to put my own reservation. Also because, Tesla's website says 3-5 months for new reservations, which means I still get a chance to get some rebates.