When was the last tour of ACDC?

Excuse me, I was wondering if you could possibly provide some information on the topic of ACDC's recent musical endeavors. Specifically, I'm quite intrigued to know when was the last time they embarked on a tour? It's been a while since I've been able to catch them live on stage, and I'm really hoping to see them perform again soon. Do you have any insights or updates on this matter? I'd greatly appreciate it if you could share your knowledge with me.