Spiritually speaking, was Jesus immortal at the time of his death?

No he wasnt immortal at the time of his death. He died, spent the better part of 3 days in the grave (or hell as KJV Ps 16:10 Acts 2:34 says). Then in spirit form he gave the value of his sacrifice to God in heaven. See Heb 9:24 - 28 1 Cor 15:42 - 49

It was after this he was granted immortality. He said at Matt 28: 18 - 20 All authority had been given to him in heaven and on earth.

Only he and those ruling with him in heaven along with God are immortal.

Immorral life is granted by God to those who prove their faith, sometimes like Jesus to the death. At Matt 20:22 he asked if his disciples could drink the cup he was about to drink? (Matt 26:39 Mk 10:38 14:36 John18:11)

He was speaking about hatred, persecution even false accusations that would be leveled at him and his eventual death. He had made a covenant for a Kingdom at Luke 22:28 - 30. His disciples fled. He had prewarned them after his going back to heaven he would send holy spirit to help them recall EVERY THING HE had said.

At the time of his death, NO.

The Bible speaks of Jehovah as having immortality and incorruption. 1Ti 1:17

He has granted this first to his Son. At the time the apostle Paul wrote to Timothy, Christ was the only one who had been given immortality. 1Ti 6:16

Angels are spirit creatures, but they are not immortal, for those who became wicked demons will be destroyed.

following his death as a perfect sacrifice and his resurrection, he would have to receive immortal spirit life in the heavens, thus being perfected forever for his priestly office.

the immortal life granted Jesus upon his resurrection is not merely endless but is beyond deterioration or dissolution and is beyond destruction.

No = bullsh`t eventually breaks down, and is absorbed into the ground.

Ain't nothing `immortal` about bullsh`t.

Jesus was born a mortal breathing creature and used to eat foods , drink & sleep, Jesus confirmed his powerlessness in the bible . All of this are traits of a mortal being.

I plan on being immortal right up to the point at which I die.

His human nature - that is to say: his human body - was just as mortal as ours.

Which we know because the Romans did in fact kill that.

His divine nature was, of course, immortal.

Are you being funny! He died; thus, he was mortal.

However, after being resurrected as a spirit being, in spirit body - he was given immortality.

As written in the Bible? Unclear. In Christian tradition, I'd say yes. If he is part of the Trinity, part of God himself how could he truly die

No. Well, His soul, like yours, is eternal. The only difference is that He was always before conception, unlike us.

everyone is immortal even though our carcass expires