If you need to send a JPG, it will be in 8-bit color, but that shouldn't be a problem. In fact, 8-bit data is fine for the final print output. It is best to make all changes (anti-aliasing, color space conversion, sharpening) before converting to 8-bit. If you don't see streaks on your monitor after converting to 8-bit, you should be fine in print as well. However, you can help avoid potential problems by making sure that Photoshop uses dithering to convert.