So Christ also, having been offered once to bear the sins of many, shall appear a second time for salvation without reference to sin, to those who eagerly await Him. NASB
This verse gives us a contrast, from Christ’s first coming to His second coming. He came the first time in human flesh to bear our sins; and He will come the second time, not in humility to bear sins, but as a champion to give us salvation—the salvation that He paid for on the cross.
His coming will be in two phases, from His appearing in the rapture to His coming to earth seven years later to judge the world and to set up His kingdom. I am inclined to think that this text refers more to the first phase, when we are first raptured and taken to heaven; for this is when He first appears to us and when our salvation is completed.