Ps4 temperature check

how do I check my PS4 temp in case I need to replace the thermal paste? heard it’s a thing and I had to replace the PSU some months ago, and did a cleaning but didn’t mess with the thermal paste. it’s about…6 years old I think, maybe more, and I want to check it. Also, jw, do I need an anti static strap? I’m using my model desk ( I do gundam models on it) and so I keep it sort of tidy. i know thermal paste is sort of easy to replace, but want to keep an eye on the temp.