Are these normal temperatures?
Totally normal if on the low side. If your CPU is less than 15% idle, I expect you to get to 85 C internal for CPU proximity and higher for all the on die thermocouples. Running just unde 100 C is how the silicon is designed to operate at max thermal generation and high sustained load. 

Also, if you use the command line tool to check temperatures or thermal load once every 15 minutes instead of having graphs checking every second you may find your CPU runs much cooler. After all, having those graphs update live in real time prevents the CPU from sleeping. 

 pmset -g thermlog


Lots of people are surprised or at least concerned by temps:


Are these temperatures alright?
CPU Die temperatures reaches 90&#176; C, is that normal?
Is it normal for a 27&quot; iMac to have CPU core temperatures around 95C under 100% CPU load?
Retina MacBook Pro running very hot?


From an engineering standpoint, the MacBook Pro and the iMac in the Mac Pro and iMac Pro all have the same power envelope design and push their CPU to 100 C when the work is available.  Once the CPU is at Max normal operating load then the kernel task begins to idle potential work so as not to exceed the final design for the processor.