Hi Oldgal, I try to reply best as I can. I have 2 girls in SAPS.

Teachers: all my kids’ form teachers are very approachable via emails. I try not to disturb them with any phone calls unless VERY urgent or regarding time sensitive matters. I notified them about any difficulties/absence/update of my kids via email and they always respond very promptly. While I’m in school (for any volunteer work/helping the school with events) I see many teachers who are very good role models. They greet pupils, the Principal and Vice principals sometimes have a small talk with the kids. Though a few teachers are not: boys pushed each other and a nearby teacher just stared vacantly, pupils say good morning but the teacher just walk on without replying (didn’t hear? daydreaming?).
My kids learn from early to ask questions and approach the teachers by themselves regarding school works, CCA, learning journey etc. Be proactive, teachers can’t remember all your kids’ multiple CCAs, projects, competition etc. If there’s a clash in timing it’s better for the students themselves to alert the teachers. The respond will be much more favourable.
Dismissal time is 1.45pm but those who leaves by public transport must wait for the school buses to exit the school for safety purposes.
I hope it answers your questions.