When God sent His Son Jesus Christ, it was to fulfill His loving commitment to His people via the Abrahamic Covenant. God's work is to convince the world that Jesus is His Son and Messiah.

Jesus answered and said to them, "This is the work of God, that you believe in Him whom He has sent." (John 6:29)

In several instances, Jesus Christ speaks of being sent to accomplish the works that God wanted Him to do, and He clearly states that He is only saying and doing what His Father desires.

For I have come down from heaven, not to do My own will, but the will of Him who sent Me. This is the will of Him who sent Me, that of all that He has given Me I lose nothing, but raise it up on the last day. For this is the will of My Father, that everyone who beholds the Son and believes in Him will have eternal life, and I Myself will raise him up on the last day." (John 6:38-40)

And Jesus cried out and said, "He who believes in Me, does not believe in Me but in Him who sent Me. He who sees Me sees the One who sent Me. I have come as Light into the world, so that everyone who believes in Me will not remain in darkness. If anyone hears My sayings and does not keep them, I do not judge him; for I did not come to judge the world, but to save the world. He who rejects Me and does not receive My sayings, has one who judges him; the word I spoke is what will judge him at the last day. For I did not speak on My own initiative, but the Father Himself who sent Me has given Me a commandment as to what to say and what to speak. I know that His commandment is eternal life; therefore the things I speak, I speak just as the Father has told Me." (John 12:44-50)

But He said to them, "I must preach the kingdom of God to the other cities also, for I was sent for this purpose." (Luke 4:43)

Thus, when Jesus says, "it is finished" on the cross (John 19:30), He is completing His purpose of coming to earth and His earthly role in God's plan of fulfilling the Abrahamic Covenant. For His extraordinary sacrifice in atoning for mankind's sins, Jesus is glorified; for His lovingkindness to the Abrahamic Covenant, God is glorified.

Jesus answered, "If I glorify Myself, My glory is nothing; it is My Father who glorifies Me, of whom you say, 'He is our God'; and you have not come to know Him, but I know Him; and if I say that I do not know Him, I will be a liar like you, but I do know Him and keep His word. (John 8:54-55)

Jesus spoke these things; and lifting up His eyes to heaven, He said, "Father, the hour has come; glorify Your Son, that the Son may glorify You, even as You gave Him authority over all flesh, that to all whom You have given Him, He may give eternal life. This is eternal life, that they may know You, the only true God, and Jesus Christ whom You have sent. I glorified You on the earth, having accomplished the work which You have given Me to do. Now, Father, glorify Me together with Yourself, with the glory which I had with You before the world was. (John 17:1-5)