I got mine updated yesterday (Sat, 27-Jan), too. 51xx.
Details:
Current owner
Reserved online first day (31-Mar-16)
Invited to configure 4-Jan-18
Chose Silver Metallic, 18" wheels, enhanced autopilot
Completed configuration/order the 4-Jan-18, around 8:30 pm ET.
Live in Marietta, GA (Decatur...