Congrats on your critter! I don’t keep olives or any Liasis species but have several carpet pythons in my collection.
Temps and such sound good in the enclosure and could probably come down a few degrees if it’s over 90° on the floor hot side. Much larger than I’d keep any juvenile in, but if they’re eating reliably and not stressed then play it by ear.
8 days without pooping is nothing. In that large an enclosure with that small of a snake it could be hiding somewhere. Growing snakes also use a good deal of their prey towards growth and other caloric needs and as such may not go as often. You’ll notice a “sausage butt” if they get backed up a bit. More often than not it’s nothing to be overly concerned about.
A guard around the RHP isn’t a bad idea. I’m assuming it’s already controlled by a thermostat?
Welcome to the great world of snake keeping. Post pictures if you can. Mind me asking who you obtained your critter from?