When Revelation 3:10 will happen? It will be in the future or it was already happened?
Let's write out what Revelation 3:10 says:
Revelation 3:10 Since you have kept my command to endure patiently, I will also keep you from the hour of trial that is going to come on the whole world to test the inhabitants of the earth.
There is such a thing as dual fulfillment of Bible prophecy where the prophecy comes to pass in part soon after the prophecy is announced, and then a second time in the far future where it comes to pass in full.
This promise was directed to the church at Philadelphia. I would say that it was fulfilled as promised the first time in part. But not the way the pre-tribbers think. They like to use this verse as proof that God promises that He will whisk them away before the great tribulation to avoid all the intense persecution that comes with it.
But that's not what actually happened with the church in Philadelphia. God didn't whisk them away from the persecution that came against them during John's time. As a matter of fact, eleven of them got martyred along with Polycarp. So what did God mean? It meant that God kept their faith in Him intact. They were able to go through the persecution without falling away from Him.
So this promise will be fulfilled again as Christians will go through the great tribulation. We won't be whisked away to avoid the great tribulation, but if we obey His clear command to endure patiently as the promise says, God will keep our faith in Him intact and we will not fall away during the intense persecutions of the great tribulation to come.
Just as there were some Christians from Philadelphia were martyred, so will a great many Christians will be martyred as well. We were already warned about that, so we should not be surprised and panic about it as if that was never warned of in the Bible.
To be honest, if people study all the horrible things that will happen during the great tribulation, dying is really the best thing to happen to Christians: you get to go home to God and rest with Him while chaos is wreaked on earth upon everyone else still alive - whether they're Christian or unbelievers alike.
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