ryzen7 5800x

My new ryzen 7 5800x has high utilization (and temp) in “idle”. For example, during a maven build my cpy utilization goes up to 90% sometimes with a temp of 65/70C (or even more). I know that 5800x is a very hot cpu (and i don’t have a good cooler - see spec below), so my concern is about...

I have a Gigabyte B550 AORUS PRO AC ATX Motherboard and have ordered a Ryzen 7 5800X CPU will I need to update my BIOS for this and if so how will I download to a system which cant boot without a CPU?