A couple of facts about asteroids, which happen to be my speciality.
The worst, in terms of impact frequency, is over - with the Late Heavy Bombardment. But there is no reason for complacency. If you want to know about chance or odds, ask someone who has won the lottery - or those that haven't. "I never thought it would happen to me".
If your only concern is this generation, the odds are with you. Whoever thought we would be hit by coronavirus? Will the human race survive it? Will it mutate?
If you are interested, stars and other bodies do move around in our galaxy. Just recently two objects Oumuamua and Borisov arrived from outside our Solar System. Check it out. There are millions, possibly billions, or lumps of rock far out in the SS. Some things are happening which could bring them closer to our star.
The second point is that there is a myth that we can just shoot 'em down, nuke 'em, - Hey no problem. This is cloud cuckoo land. First of all, most of these objects travel at horrendous speeds. If we detect them years in advance, we can send something to break them into smaller pieces, destroy them, alter their course. All true if we spot them in time. Only a decade or two ago (see above) two bodies passed close by in one day. One we did not know of until after it has passed us. Just look at the speed. From Wiki:
When a meteoroid, comet, or asteroid enters Earth's atmosphere at a speed typically in excess of 20 km/s (72,000 km/h; 45,000 mph), aerodynamic heating of that object produces a streak of light, both from the glowing object and the trail of glowing particles that it leaves in its wake.
Imagine trying to 'neutralise' something coming towards us at 45,000 mph. You have to get to it, arrange your little bomb or whatever, and hope it works. In some cases it will (hopefully). It may be that you can break it up. Just make sure that not one of the pieces is not large enough to destroy us. Maybe the bits are small enough to destroy only a few 'insignificant' places like London, Los Angeles and Moscow. Hurrah! It didn't touch Brisbane, Montreal and Johannesburg.
We are told, and we believe, that research is ongoing. We have to be able to detect a large object of low albedo (difficult to see) coming "out of the Sun". Out of our blind spot and nearly invisible. There is much more to be said, but that is enough for now. The dinosaurs did not have any defence. We don't have much more.