Right, most gpu's can go over 90 degrees (especially Nvidia's cards), if AMD cards go above 70 they will probably blow up, lol. No AMD cards cannot go up to high temperatures. Also whilst gaming this is normal, especially if you're running the game on ultra. Gaming on high settings or just any gaming uses a lot of the gpu. So you're fine there as long as your gpu doesn't go above 90 I would say (if you have a Nvidia card).
Now your cpu, this is a different story. If your cpu goes over 70 degrees it is overheating. This applies for AMD cpus and Intel. So, if your cpu is at 70+ your damaging it.
By looking at your screenshot I can tell that your cpu is not overheating @ 61 degrees and neither is your gpu. The GTX 970 should be able to go over 90 degrees.
Overall, don't worry. The Witcher 3 is a graphics intensive game, and it will cause your components to warm up a little. Just make sure your fans are all working correctly, and if you want cooler temperatures buy a new cpu cooler or just turn the fan speeds up a bit.
Hope this helps