Make the croutons and olives: Heat oil in a large high-sided skillet over high heat until it reaches 360 degrees on a deep-fry thermometer. Fry bread and olives until bread is golden, about 5 minutes. Transfer the mixture to a paper-towel-lined plate using a slotted spoon.
Make the dressing: Whisk together oil and vinegar. Season with salt and pepper.
Make the salad: Combine tomatoes, cucumber, dill, and onion in a large bowl.
Toss salad with dressing. Arrange feta on a plate. Top with salad, croutons, and olives.