tonight: plus, stephen welcomes: daniel radcliffe and musical guest dan + shay featuring jon batistetay human. and now, live on tape from the ed sullivan theater in new york city, it's stephen colbert! ( cheers and applause ) ♪ ♪ ♪ ♪ ♪ ♪ ( cheers and applause ) >> jon: yeah! >> audience: stephen! stephen! stephen! ♪ ♪ ♪ >> stephen: welcome, welcome, ladies and gentlemen to "the late show." i am your host, stephen colbert. all week-- ( cheers and applause ) if you've been watching the show, you know all week i've been talking about what's going on in afghanistan. it's a comedy gold mine-- in that trying to do jokes about it makes you feel like you're trapped deep underground without enough oxygen. but today, all the news from there is "wait and see." so i, too, am going to wait, and see what else there is to talk about-- you know, lighter news, like the delta variant. ( laughter ) speaking of which, we're getting reinforcements to fight it. today, the biden administration announced booster shots will be offered to americans beginning september 20. of course-- ( rse ) the vax man's her