If the Jews, in the days of Jesus, held their Passover Sabbath on Thursday, this would make Friday an ordinary day, and the women would have went to the tomb with their spices to prepare the body of Jesus early on Friday morning.
The women needed to prepare the body with their spices as soon as possible. They couldn't do it on the day that he died because they had not prepared the spices at that time, they couldn't do it on the Most High Sabbath of Passover, nor could they do it on the weekly Sabbath, Sunday morning was their earliest opportunity.
The Jews divided their day into a 12 hour night followed by a 12 hour day. Jesus said; "A day has 12 hours has it not, so work while the light is with you.
On the 6th hour of the night of Thursday [Midnight] on the day of PREPARATION TO THE PASSOVER, [See John 19: 14.]when Pilate passed Judgement on Jesus, the Jews would not enter the Gentile praetorium that night on the Day of Preparation to the Passover, as that would have made them ritually unclean and they would not be able to eat the Passover meal on the next evening. See John 18: 28.
Jesus was nailed to the cross on the third hour of daylight, 9 AM on the day of preparation to the Passover, and he died on the 9th hour 3PM on the day of preparation, and by the time that his brother Joseph and Nicodemus received permission to take his body down, and wrap it in linen etc, the sun was beginning to set and the Jews were preparing to eat their Pascal lambs that had been killed between the two evenings of the Day of Preparation to the Passover.