I hope you know that it doesn't matter what time you eat, your calories intake per day is the same. So go ahead and eat up for your dinner.

Anyway going back to your meal plan... it's not very healthy. Lack of nutrients. I've just talked about Granola bars in one of the thread and it's packed with sugar so you wouldn't want to take it daily. Take the bar sparingly or as pre-workout to give you the energy needed.

You're not taking any carbs? They're not bad, you know. Take some rice (brown rice has more nutrients than white) along with your chicken and vege. You can have the same healthy meal for your dinner (rice, chicken, vege). No doubt you're able to drop some weight based on your current meal plan but I don't think that this is something that will last. You need to plan for long term, not temporary.

Yes, take granola bars once in awhile, I'm limiting myself to max 2-3 bars per week. Only take when I really need the convenience.

You're losing weight because:
Output > Input (food intake)

If you need 1,500kcal to maintain your body weight each day and you're only consuming 1,000kcal per day, no doubt you'll see your weight dropping.

Workout plan? You mean swimming on Monday, Wed and Sat?
Besides, you'll need to state what sort of workout you're referring to. Weight lifting? Do you do cardio?