These are the famous Ryzen spikes..... totally normal as you see the temp on the single core that is being boosted at any one time, this is what Ryzen does and irritates Intel users that are not familiar with how the Ryzen boosts very quickly to do a task and then back down. But if you live where it is warm the stock cooler while pretty good for a stock is way off what cooling can be achived with better aftermarket cooler like this as an example....
Noctua NH-D15
But you should always check that you case has enough clearence for these bigger and better coolers. You are always going to have ambient temp plus 10c as your idle temp, one way to control the spikes is to use "Balanced Power" setting in Windows but even more effective is to set a new CPU core ratio in bios of 4.2 for example and turn off PBO (not much use anyway in my experience) and that will help big time, there is going to be a very small drop in performance in benchmarks but not noticeable in day to day gaming etc.
Your temps considering your room temp are absolutely fine though and nothing to worry about, but I would recommend a better cooler for long term peace of mind and a quieter PC as the fan won't have to work so hard.