The image below is an example of off camera flash during the day using a pocket wizard and 1 Canon Speedlight flash. The image was captured around 4:30 on a warm, sunny, summer afternoon on the shaded side of the building. My lovely assistant (AKA his mom) holds the flash set at +2 about 8 feet to the left of the subject or camera right.
F8 at 1/200, ISO 100. Canon 5d Mark 2.