The tomb was sealed and guarded. Even if they had went on Friday, they would not have been permitted to enter - indeed it would have taken some time to remove such a seal as described
the guards were there to prevent stealing of the body, not to stop anointing the body with spices and oil.
In any regard, the tomb was seal and it isn’t likely anyone would have been allowed in nor the seal removed under penalty of death for the guards in charge.