"Sorted" is a word used here to mean that a task has been completed. e.g. "Did you get that thing sorted yet?" "yeah, I sorted it out last week." It can apply to basically anything. You might also simply say "Sorted." as you finish doing whatever it is you're doing, to announce that you are finished. Similar to just saying "Done." or "Finished." in this respect, possibly with the added implication that there was a problem that has now been solved.