There are two things you should know:
1) Adobe has abandoned its reliance on Nvidia cards for ray-tracing in favor of Cinema 4D Lite, which comes bundled with AE, does the same things and does them faster.
2) You no longer BUY the latest versions of AE, the Creative Cloud versions. You rent them. There will be a monthly expense. If you decide to stop the monthly rental, you will be unable to open your AE project files after three months' time.
As Dave hints at, AE uses the GPU for very little - see here: GPU (CUDA, OpenGL) features in After Effects
Some third-party plugins (like Element 3d or Red Giant's Universe) do use the GPU, but they have completely different requirements from AE's old "approved for ray-traced acceleration" list.
Also as Dave mentions, the After Effects team at Adobe have stopped development of the ray-traced renderer in favor of ever-increasing integration with Cinema 4D. And Cinema 4D (Lite) now comes included with After Effects! Check out the details of CINEMA 4D integration with After Effects here
Thanks for your quick answers, Dave and Szalam.
Have a nice weekend!