It mattered enough that Jesus responded to him by telling him he would be in paradise that very day.Bro the thief on the cross falls under OT law he does not know the resurrected Jesus in his lifetime. The apostles had to wait for the promise of the father to be sealed with the holy spirit. How is the thief saved? While he was alive or after he was dead?
Luke 23:39-42 ESV
39 One of the criminals who were hanged railed at him, saying, “Are you not the Christ? Save yourself and us!” 40 But the other rebuked him, saying, “Do you not fear God, since you are under the same sentence of condemnation? 41 And we indeed justly, for we are receiving the due reward of our deeds; but this man has done nothing wrong.” 42 And he said, “Jesus, remember me when you come into your kingdom.” 43 And he said to him, “Truly, I say to you, today you will be with me in paradise.”