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I think it would last for a little bit yet so if you wanted to buy gpu now and then upgrade cpu/mobo in a few months that would be ok.I have a i7 4770K cpu and looking to get a graphics card RTX2070-80 Super.
Will I have any issues with my CPU? Bottle neck?? Do I have to buy new mobo/cpu
You'll see a bottleneck in certain situations in the really CPU-heavy titles (the past couple of Assassin's Creed games for instance), but even then it'll still be a much better experience than using the same CPU with a less powerful card, especially at 1440p with adaptive sync. It's not like we're talking about a Sandy Bridge i3 or something either. The 4770K is still pretty capable, especially with an overclock.