If I am 5’7" and weigh 200 lbs, am I overweight to get a BBL done or should I lose weight before the surgery? (Photo)

Optimal candidates for surgery should have reached a healthy stable weight preferably with a BMI < 30. My recommendation is for pre-op weight loss (easier said than done). This will lower your overall surgical risk profile and likelihood of complications. 
With regards to your specific question, your current BMI of 31 puts you just above the goal standard as far as weight. Some additional weight loss would help improve your risk profile. However, patients regularly undergo procedures with BMI above 30. If you plan to lose weight it is always best to pursue this pre-op rather than post.Based on your photos, you are a good candidate for an abdominoplasty. I do not regularly perform BBL and tummy tuck simultaneously. Stacking these procedures can be safe, although staggering them is relatively more practical/sensible (when one considers post op recovery). If one can make the necessary accommodations for recovery, the procedures should have no effect on each other. There are pillows/mattress which may be of help, however, it is up to the patient to decide of these accommodations can be made.
If you choose to stage, there is no perfect order for undertaking these procedures. Undergoing BBL first necessitates fat harvest from areas where skin laxity/excess may already be an issue. Harvest will only exacerbate the problem which will then only be addressed at the time of the abdominoplasty. This does, however, optimize fat harvest. Beginning with an abdominoplasty, will avoid the problem of excess skin but compromises fat harvest. 
As always, discuss your concerns with a board certified plastic surgeon (ABPS).

A good candidate has enough fat available for transfer in the procedure. The amount of fat that can be transferred in a BBL depends on how much fat the patient has to harvest and the amount of space there is to move the fat into. It is recommended for the patient to have a BMI of 30 or less. If you are too thin, a Brazilian Butt Lift may not be possible.

Dear  TeamJR_35,Generally speaking, you want to reach your goal weight before you consider a BBL, otherwise your results will be suboptimal if you continue to lose weight after the surgery. Based on your photos, you look like a good candidate for a BBL and TT. Liposuction of your abdomen, back and flanks should give you more curves and hourglass shape and fat transfer to buttocks should give you more projection. Full tummy tuck should tighten your abdominal muscles and remove the excess skin.  I would suggest you to consult a board-certified plastic surgeon because only after a thorough examination you will get more information and recommendations.Daniel Barrett, MD
Certified, American Board of Plastic Surgery
Member, American Society of Plastic Surgery
Member, American Society of Aesthetic Plastic Surgery