So they are to look for SIGNS of it coming?
Certainly. One of the biggest signs was increased immorality; we see how far and fast things fell during the Obama administration, for one sharp example.
That's the ticket is to look for the signs. You might say you could speed up His coming by voting Democrat. He is waiting for the iniquity of the Amorites" is not yet complete. (Gen 15:16) When the earth got so bad God told Noah to build an Ark. When Sodom got so bad, Lot was removed by God from Sodom.
Luk 17:26 And as it was in the days of Noah, so it will be also in the days of the Son of Man:
Luk 17:27 They ate, they drank, they married wives, they were given in marriage, until the day that Noah entered the ark, and the flood came and destroyed them all.
Luk 17:28 Likewise as it was also in the days of Lot: They ate, they drank, they bought, they sold, they planted, they built;
Luk 17:29 but on the day that Lot went out of Sodom it rained fire and brimstone from heaven and destroyed them all.
When God is ready to destroy the earth it will be like the previous times. The Days of Noah reflect the previous verses at Gen 6:1. The Fallen Angels mated earth women and produced monsters. These Nephilim ate people and practiced witchcraft and all sorts of other evil. The main sin was producing people God hadn't created. They corrupted the DNA that God produced in the Garden of Eden and produced something God didn't bless with "It was Good". Today we are editing DNA to produce chimera's that are half human and something else. This was done to corrupt the seed that was to produce Jesus to kill Satan's seed. The seed war started in Gen 3 started a series of events through history to stop Jesus from birth including killing all Hebrew babies in Egypt but Moses was saved, up to killing all babies born in Bethlehem at the birth of Jesus. There was trouble at Judah and Tamar and many other places in Scripture. An interesting verse can be found in Daniel 2:43 about mixing seed and the Antichrist.
Of course most of us can figure out the "Days of Lot. Sodomites wanted to rape the 2 angels sent there to rescue Lot and family. If you read it carefully, ALL people came to either participate or at least watch. They all approved of what was going to happen at Lot's house. Look at how crazy we are today. We approve of sodomites teaching our children, sleeping together as scouts, allowing men in women's restrooms, you know the drill. We can't even look at a person with a penis and know he is really a man without asking what pronoun he chooses. That's pretty far down the road.
Romans 1:18-32 is interesting in the fact that Paul says because God wants us to acknowledge Him as Creator, He gave us over to a reprobate mind and the first thing spoken of from reprobates is homosexuality. He is saying if you believe in evolution, you will believe anything so we have been given all this crap about sodomy being normal and all the diseases that go with it. Even if you approve of it but don't participate, you are guilty of it.
Mat 16:2 He answered and said to them, "When it is evening you say, 'It will be fair weather, for the sky is red';
Mat 16:3 and in the morning, 'It will be foul weather today, for the sky is red and threatening.' Hypocrites! You know how to discern the face of the sky, but you cannot discern the signs of the times.
Jesus is saying we know what is happening but can't understand the time is near for Judgement. If we choose to live in this sinful world and do nothing about it, get ready to be judged. You can't kill 65 million babies,(that's more people than dies in WWII) and accept sodomy, along with fornication, adultery, blasphemy, idol worship, and the rest, yet not believe God is coming to make things right, including your own judgement. So many think they are covered and gladly wait for Jesus' return, but will hear "Go from Me, I never knew you!" when He returns. Time is short and we all need to work for the Kingdom to gather treasure in Heaven.