Things will start moving at a fast pace after Feb 29 - the last day to add to your file.
About 80% of Members of Congress (MOCs) nominate 10 people for their vacancy and let WP decide on the best - the other 20% decided the vacancy winner themselves. For those candidates who are one of 10 - WP Admissions will determine the vacancy winner by about mid-March or earlier. Those offers will go out quickly - probably before the end of March.
Those who are nominated (not vacancy winner) and are 3Qed (completely qualified in every area) will be put on the National Waiting List. As mentioned in many post, at least 150 will be activiated from that list by Law. Most of these will be people who got an LOA. However, usually about another 200 on this list will be admitted for various reasons - very highly qualified, minority, recruited athelete, etc.
By the end of March the class will be almost full. There are always some additional admissions offered as a few people who have been given offers decline their appointment (they have until May 1 to accept or decline).
If you are not a vacancy winner it is now a waiting game.