Then by that logic, we don’t need to bother to ask our friends, family, and fellow Christians to pray for us.
Also, read Revelation 8:3-4, which shows a scene in heaven:
8:3. And another angel came and stood before the altar, having a golden censer: and there was given to him much incense, that he should offer of the prayers of all saints, upon the golden altar which is before the throne of God.
8:4. And the smoke of the incense of the prayers of the saints ascended up before God from the hand of the angel.
If those who die in Christ are present with the Lord, then surely they would be aware of the prayers of those still on earth.