"High time" is too formal for the voice I'm using in this work.
It's about time (idiom)
Informal —Used to say often in an annoyed way that something should have happened sooner
It's about time you got here. I've been waiting for over an hour!
"They're getting married." "Well, it's about time! m-w
"High time" in this context seems more like a pun than formality.
I badly need a shower.
2.1 Very much or intensely.