If you need to know if a subway elevator or escalator is out before you head out, you'll be able to see outages on the MTA's Web site beginning tomorrow. The plan to do this was announced long ago and promised to be close to real time. The updates will progress to 24/7 in the coming months. For now, the Web site will be the on-line version of the Elevator and Escalator Hotline, which disability advocacy groups have claimed is unreliable and only updated four times a day.