That isn’t high for that processor.
If the processor detects a temperature too high, it’ll shut down hard. For an upper-range temperature, the processor (and the integrated graphics, in this case) will throttle. Will slow. Which’ll run cooler. Otherwise, the cooling provided by the airflow and the conduction is sufficient.
Throttling is why you want to look at the Intel base clock rate when buying and not at the boost “turbo” clock rate, as you’re going to get base clock and only get the boost rate when thermals allow.
Now… do you want to know more about this; to better understand this stuff? If so, look up the specific Intel x86-64 processor itself (i5-8279u), then go to the Intel website, and locate the data sheet for that processor, or that processor family (Kaby Lake), and start reading. Put slightly differently, if you don’t want to learn about how to look up the processor and then the processor type and to then find and read the Intel specs, then ask yourself why you’re looking at data you don’t understand. If you do want to look this up and do want to look this up, you’ll find that this temperature (88°C) is within the acceptable running range for Intel i5-8279u. (Which is certainly also very strongly implied by the “it’s up and running, and has not shut down hard”, which is what happens when a processor reaches its limits.)
It’s in the upper end of the range, but then you’re also running Google apps and Electron-based apps. These among the Adobe Flash why-is-my-laptop-running-so-hot apps of this era.
If you want to compare thermal efficiency and which can mean better battery life and cooler running temperatures, the Apple M1 processor does quite well.
ps: KBL U/Y i5-8279u upper TDP is 100°C. That’s ~when it’ll be running active cooling on blast, throttling, and will drop out hard.