Hi xavgreat06. In direct answer to your question: Yes, I'm highly confident that your two future GTX 1070 Ti's OC in SLI will be supported by your Ryzen 5 2600 OC, in the majority of games. This is assuming that those games support SLI of course. The bigger question to me is whether your motherboard will support SLI. I recommend that you verify that.
Btw: I secretly wish that the Nvidia RTX 2060's supported SLI (NVlink).