No. It's not realistically a bottleneck. A bottleneck is a component that slows down the flow of info. The cpu will pre-render X amount of frames and thats it, no more. It'll send every last one of those frames to the gpu to be processed and put up on screen. If the gpu cannot fulfill that, the gpu is a bottleneck, it's slowing down the flow. If the gpu can do it, then good. Just because a cpu puts out less frames than the gpu can process doesn't make it a bottleneck, the flow from the cpu at 100%. It's the software that dictates the amount of frames a cpu can pre-render. Obviously a stronger, more able cpu will pre-render more frames. Just as obvious is that other factors can play a role, ram, ram speeds, storage ability etc.
By itself, there's no such thing as a bottleneck as perceived. You'll only know any component is slowing down info if there's a comparison. And comparing your pc against YouTube videos, online bottleneck calculators etc is a fools game.
I get 300fps in cs:go with a 3770k and gtx970. With a rtx2060 I'll get 300fps. With a 2080ti I'll get 300fps. Why would bumping up power in the gpu all of a sudden make my cpu a bottleneck. It isn't. It put out what it puts out. You only perceive its a bottleneck because you expect a stronger gpu should have higher fps. Reality is, the cpu is capable of 300fps in that game, at those details, at that resolution, it just happens to be lower than what those gpus, mine included, can output. Change games to my heavily modded skyrim that uses 170 scripted mods, fps drops to 60. At that output, even a 750ti wouldn't have any problems. Cpu bottleneck? No. Software flood.