Do these look like 600cc implants and will I be a DD? (Photos)

Hello, thanks for your question.  There is no way to tell your implant volume or predict your cup size based on a photo.  Your surgeon will be able to provide this information.  Their surgical records should record the exact volume of saline in each implant.  Patients should to be able to get their surgical record on request.

Congratulations on having undergone the breast augmentation procedure.  Your plastic surgeon will always be your best resource when it comes to accurate information and/or meaningful reassurance.
 There is no accurate/reliable/predictable correlation between size/profile breast implant utilized and cup size achieved. For example, I do not think that the generalizations of "200 cc equates to 1 cup" hold any validity or are helpful in any specific or practical way. 
 I suggest that you wait to evaluate the final result/size of the surgery (and go bra sizing/shopping)  when you are about 6 months to a year out. I would also suggest that you do not base your satisfaction with the results of surgery on a specific cup size, given that this is somewhat arbitrary and dependent on who makes the bra (and who does the measuring).
 
 Many of my patients report that as the swelling around the breast implants (for example, in the sternal area) decreases, they feel that their breasts appear more projecting (and that they have better "cleavage"). Also, in my opinion, the "drop and fluff” phenomenon does hold some validity; as breast implants “settle”, many patients feel that their breasts actually look larger. Similarly, it takes a few months for the breasts to "soften" in most cases.  Most of my patients tell me that their breast implants feel "part of them" somewhere between 3 to 6 months after surgery was performed.  There is definitely a physiologic and "psychological" (body image)  adaptation process that occurs, at differing rates for every patient, for patients who undergo any type of aesthetic surgery, including breast  augmentation surgery.   
 
 Best wishes for an outcome that you will be pleased with long term.

It would be best to confirm your size implants with your surgeon. Also, you are very early in your healing phase and need time for your tissue to relax and the implants settled. Once settled, you may find bras fit better and may even be in a different size. Bras, however, are not make to standardize sizes and can vary depending upon the manufacturer.