No. Oppo R17 does not have the 3.5 mm headphone jack. You need to use the USB type C supported earphone. You will get one in-side the box.
No. Oppo R17 Pro does not carry any kind of IP ratings. So, certainly, this phone is not a waterproof mobile phone.
Yes, Oppo R17 Pro does have the face-unlock function. The phone also has an in-display fingerprint scanner.
As of now, Oppo has not announced any support for 5G network on Oppo R17 Pro.
No. Oppo R17 Pro does not support wireless charging.
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.