Showers are great, well worth it. Your DS will probably reach out for the water and maybe even dunk his own head in it, trying to get a mouthful of it - lol. If you can, its easiest to have a second person to hand bubs to, to dry - while you finish up in the shower. If not, its easy enough to lay them on a towel on the floor, wrap them up a bit - while you quickly get dry.
Best of luck - its loads of fun. Just hang onto them when they are soaped up, such slipperly little suckers - lol.
DD is 3yr 8 months - DS is 6 months