There could be several different things going on here.
To answer if it’s normal. I can be depending on work load. I’ve had some hot MacBook Pros from earlier years that I’ve seen get into the 90+C range and still operate. Although at that level you should hear the fans kicking in at a decent volume.
If you just installed Catalina as an upgrade, it might be rebuilding the Spotlight index which would use up system resources.
You could check the CPU usage by going into Launchpad -> Utilities -> Activity Monitor. Under the CPU tab you can sort by CPU % and see what’s using up the most resources. If it’s an app that you can close, check to see if that lowers the temp any.
What did the place you purchased it from do to “refurbish” it? If they didn’t open up the MacBook Pro and clean out the fan and vents, it could cause it to run hot as well. Using compressed air to move dust out of there would help greatly.
You’re English is great, and I hope that this helps.