Will Mueller delay sentencing for Michael Flynn?

The lawyers asked to delay Flynn's sentencing who found guilty to lying to investigators in December and is cooperating with the investigation into Russian interference in the election.
Special counsel Robert Mueller's office is still working with former national security adviser Michael Flynn. 
"Due to the status of the Special Counsel's investigation, the parties do not believe this matter is ready to be scheduled at this time," the filing said.
They asked for another two months before they must update the court again.