My desk lamp and the Verizon FiOS modem+router combo device (G3100) only draw about 2W from the UPS (well the G3100 was mostly idle at the time, there wasn't a lot of network activity going on). My 3 monitors use about 100W together, my 5.1 speaker system adds about 20W (well when not playing anything), and my NAS uses about 30W. The PC itself, when idle (or during light usage like web browsing and word processing), uses between 170-200W. When gaming with an RTX 3090 (MSI Suprim X) I recently got, the highest I've seen reported by the UPS software so far was just under 800W. I haven't seen it crack 800W yet. My PSU is a Seasonic-built Corsair 850W unit I bought in 2010 (and which has been used all day almost every day since, so it has a lot of hours on it), and my UPS can handle 900W max.
This is not the highest I've seen, but close to it: