You won't find any standby fares for normal every day passengers any more. Staff travel and family/friends of staff are the only time I ever see them.
You can get waitlisted passengers who may be booked on a later flight but turn up very early so can be put on "standby" for an earlier flight and get a seat if one is free at the last minute. It's not that common to see though. This isn't generally available to normal passengers except in extreme circumstances and even that would be at the airlines discretion. Most waitlisters would be people who bought fully flexible tickets or high tier Frequent Flyer status customers who may have entitlement to such benefits. They aren't really standby in the true sense of the word as they have confirmed tickets for later services and have often paid a lot for it too!