Will Christ at the second coming be made of flesh?
Yes. This is what the Bible says:
It is true that “the Word became flesh and dwelt among us” (John 1:14). The Word gave up the glory he had in heaven and became a little lower than the angels in order to do the will of his Father in heaven.
But we see Jesus, who was made a little lower than the angels, now crowned with glory and honour because he suffered death, so that by the grace of God he might taste death for everyone (Hebrews 2:9).
This is Jesus, who lived, died and then was resurrected with a body of flesh and bones. The resurrected Jesus told his disciples he was not some sort of spirit creature:
A spirit does not have flesh and bones as you see I have (Luke 24:39).
Acts 1:9-11 tells us that just as his disciples saw him ascend into heaven, so he will return in the same way:
After He had said these things, He was lifted up while they were watching, and a cloud took Him up, out of their sight. And as they were gazing intently into the sky while He was going, then behold, two men in white clothing stood beside them, and they said, “Men of Galilee, why do you stand looking into the sky? This Jesus, who has been taken up from you into heaven, will come in the same way as you have watched Him go into heaven.
Jesus was resurrected with a glorified body of flesh, an incorruptible body, fit for eternity in heaven. His followers, who look to a heavenly citizenship, await the return of the Lord Jesus Christ who is empowered to
transform our lowly bodies so that they will be like his glorious body (Philippians 3:20-21).
His glorious body is an incorruptible body, one that will never die. In this way, Jesus' resurrected body is different from his pre-resurrection body. Nonetheless, when he returns, in glory and accompanied by all the heavenly hosts, it will not be as a spirit creature, but as the resurrected Christ - and every eye will see him.
As a response to the comment left by @user47592: Jesus own words prove that the resurrected Jesus was not a spirit creature but had a body of flesh and bones (Luke 24:39). Acts 1:11 informs us that Jesus will return “in the same way as you have watched Him go into heaven.” It was not a spirit creature that ascended into heaven. It was the glorified, resurrected body of Christ Jesus that his disciples saw.
There is nothing invisible about the return of Jesus:
Look, he is coming with the clouds, and every eye will see him, even those who pierced him; and all the peoples of the earth will mourn because of him. So shall it be! Amen (Revelation 1:7).
Nowhere in the Bible does it say that Christ Jesus will return as a spirit creature.
If you disagree, feel free to down-vote my answer but it would be more honest to post your own answer to the OP’s question and explain to everybody why you disagree with Ken Graham and myself.