I too was in the process of reinstalling the whole thing on my two Pi 1B's so I created below for reference:
Below is the current idle load doing nothing:
$ uptime
05:32:34 up 1:28, 2 users, load average: 0.08, 0.05, 0.20
I have not switched live yet but dont expect the load to increase that much.
Maybe .40 or .50 max as was with the Pi-hole v5 release.