Key text: I am Alpha and Omega, the beginning and the ending, saith the Lord, which is, and which was, and which is to come, the Almighty. Rev 1:8
Christ is the Lord who was, who is and who is going to come; Christ is talking here not the Father as watch tower society teaches.
Jesus and His Omnipresence:
Philip findeth Nathanael, and saith unto him, We have found him, of whom Moses in the law, and the prophets, did write, Jesus of Nazareth, the son of Joseph. And Nathanael said unto him, Can there any good thing come out of Nazareth? Philip saith unto him, Come and see. Jesus saw Nathanael coming to him, and saith of him, Behold an Israelite indeed, in whom is no guile! Nathanael saith unto him, Whence knowest thou me? Jesus answered and said unto him, Before that Philip called thee, when thou wast under the fig tree, I saw thee. Nathanael answered and saith unto him, Rabbi, thou art the Son of God; thou art the King of Israel. John 1: 45-49
Jesus could see Nathaniel even though He was physically present somewhere else in His body.
Please note: Christ during His incarnation limited His Almighty nature and used it only at the will of His Father.
For where two or three are gathered together in my name, there am I in the midst of them. Mat 18:20
Jesus can be present everywhere and hence He promises to be present when people gather in His name.
Jesus and His Omniscience:
But Jesus did not commit himself unto them, because he knew all men, And needed not that any should testify of man: for he knew what was in man. John 2:24, 25
Bible says Jesus knows everything.
And Jesus, perceiving the thought of their heart, Luke 9:47 (marginal)
Jesus and His Omnipotence:
…and by him all things consist. Col 1: 17 (marginal)
.. upholding all things by the word of his power.. Heb 1:3 (marginal)
Bible says everything in the universe functions by the power of Christ.