If you are not able to upload on a regular basis I would most likely do the same and upload the lot. Thing is you have to hope for the best on approvals and have more rejected than accepted out of the bunch can be very discouraging. If that does not bother you much go for it.
Online as soon as possible. But beware, for some reason your images can be with problems (I remember a lot of rejected images because I did not know that 3 lines on a sport cloth is trademark by Adidas) so a small test will be good first.
Your portfolio is still fairly small, you are still probably discovering the limits of what is acceptable and what is not for DT photos, so I'd suggest not to rush things. By doing submissions in small batches you can learn as you go, and improve your acceptance ratio by the end of the process.
I think, too, that you should upload some kinds of your images and see what is accepted and what is not. By the time, you can benchmark your images with others and see if other similar works are too much better than yours or not. I generally do this. Then, you can upload bunch of images. The approval ratio is important and you don't want to let it decrease too much. I try to keep mine at %75, overall. On the other hand, when someone steps in your portfolio page, I think it's better to see 10 high quality pictures, instead of 50 overall images. Quality is everything, if you can mix the Quality and Quantity; you are the king :)