The deadline for the report to be presented was extended after the committee said it wanted to analyse the evidence collected from key persons mentioned in the saga.
The committee heard from Tunoi, Nairobi Governor Evans Kidero – who is accused of offering the judge the bribe – as well as journalist Geoffrey Kiplagat who blew the whistle.
Also interviewed by the committee were lawyers Katwa Kigen and Issa Mansur as well as officials of a mobile telecommunications company through which calls were allegedly made and text messages sent.
Should the JSC find merit in the claims, it will recommend suspension of the judge and the appointment of a tribunal to investigate his conduct.
If the tribunal finds him guilty, they will recommend his removal from office.
READ: Judiciary on trial: Tunoi saga deals courts a blow
He would then become the first Supreme Court judge to be sent home for receiving a bribe to influence judgment.
Tunoi has however denied receiving the bribe and challenged anyone with a contrary opinion to offer proof.
READ: Show me the money, Tunoi tells JSC over alleged bribe