Without doubt, Jesus exists outside of time as we know it. He appeared in person to many individuals whose lives were separated by centuries.
What the apostles didn't witness, could not have witnessed, was Jesus appearing bodily, centuries earlier, to other patriarchs.
During the first century, the apostles, Peter, James, and John, witnessed Moses and Elijah appear bodily before Jesus.
Who were these people to whom Jesus appeared before his birth in a manger in Bethlehem? .
He is an eternal being. The apostle John wrote, “In the beginning [of the universe, Jesus] already existed." (John 1:1 NLT)