Yes we’re definitely living in the last days I have little doubt about this. Humans won’t be around much longer the way things are doing, I don’t think. Not unless there is a God, or aliens, or something else that will save us. To quantify that a bit more, I think there’s a reasonable chance there’ll be an extinction, or near extinction event sometime this century, probably even by 2050, whether by nuclear war, artificial intelligence, or something else.
Two good books by academics on the topic: The Precipice by Toby Ord, and Our Final Century by Martin Rees.