Time Condor (A) and Time Condor (B) on opposite sides of the field. A is delayed; during its owner's turn, B will attack A. The thing to worry about would be if A & B were on the same side of the field, and one got delayed for some reason...under the wording, this would target its own side if possible.
Also, wording should probably be changed anyway for clarification to "Time Vulture will attack one delayed creature per turn, if possible." for first line. As it is, Procrastination would cause a single entity to attack multiple cards during a single turn.