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Even with the current predictions we are still in the ahhh shit phase. Nasa has less than twenty people trying to find all the potential impact rocks in space. Only a very small few have been found and checked for orbit and the like.
Even those can not be certain due to outside collisions in the asteroid belt that very well could push stable rocks out of their current orbit.
Then as we have learned with the meteor in Tunguska, that was an air burst and not an actual impact. Even bigger air bursts sites are being found and looked into a lot now. Example is the one that went off over the Sahara in Egypt that created the desert glass, and other locations in China and places where we have glass and or shocked quartz. Impact is not always needed to be extremely damaging no mater what is below it.
As for the silly replies about shooting it down, blowing it up, whatever. It just does not work that way. Stupid gravity and all just would reassemble the large rock into a huge pile of smaller rocks to pelt us with. Rubble piles are just as bad, and even worse if we do nuke them or something since they would now also be radioactive. Our only real chance if we find one is to find a way to push it some to change its course.
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