is it extinct now?
Yes.
Dire wolf
 One study proposes that several extinction models should be investigated because so little is known about the biogeography of the dire wolf and its potential competitors and prey, nor how all these species interacted and responded to the environmental changes that occurred at the time of extinction.

how long ago did the dire wolf live Approximately 125,000 – 9,500 years ago.
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Dire wolf [SEP] Extinction
Ancient DNA and radiocarbon data indicates that local genetic populations were replaced by others within the same species or by others within the same genus. Both the dire wolf and the Beringian wolf went extinct in North America, leaving only the less carnivorous and more gracile form of the wolf to thrive, which may have outcompeted the dire wolf. Dire wolf remains having the youngest geological ages are dated at 9,440YBP at Brynjulfson Cave, Boone County, Missouri, 9,860YBP at Rancho La Brea, California, and 10,690YBP at La Mirada, California. Dire wolf remains have been radiocarbon dated to 8,200YBP from Whitewater Draw in Arizona, However, one author has stated that radiocarbon dating of bone carbonate is known to be unreliable, and that while many dire wolf remains are found in fossil assemblages dated to the terminal Pleistocene, there are no confirmed Holocene finds.