That's not exactly true. Sullivan's order was dated 12/12/2017. The motion to delay the sentencing was filed within the last 3-4 weeks.
What precipitated the motion to delay the sentencing was the release of the HPSCI/Nunes memo (the motion was filed within 48 hours of that release), and the references to FISA warrant abuse and other malfeasance in the FBI.
Thank you.