I expect ray tracing support may appear in drivers for recent GPUs even if they don't have dedicated hardware. You might want to save your money until your sure it's worth it.
I thought that already happened?
Yes for one generation of NVidia, not sure about AMD/Intel, and I'm not sure the x-platform x-vendor APIs are settled yet. Unless you really need to buy right now, I would wait to see what the 5th gen consoles and the NAVI2x & Ampere GPU ranges have to offer later this year.
