Yes, Oppo R17 Pro does have the Corning Gorilla Glass 6 display protection. In fact, it is the world's first phone with Corning Gorilla Glass 6 level of protection.
Yes, Oppo R17 Pro does have the NFC support.
Oppo R17 Pro has Qualcomm Adreno 616 GPU.
Yes, Oppo R17 Pro does have the face-unlock function. The phone also has an in-display fingerprint scanner.
No. Oppo R17 Pro does not carry any kind of IP ratings. So, certainly, this phone is not a waterproof mobile phone.
Oppo R17 Pro has a lot of points going in its favour like excellent set of cameras, great display and design as well as top-notch performance. I think Oppo R17 Pro can give solid competition to OnePlus 6T going by the overall performance.