Usually the bonus will be separated starting with the monthly bonus then the Watford bonus , normally a week after Watford win then the bonus out while the monthly bonus is between the 14 -16 days.
I honestly doubt Watford will stay in the premier league the situation is unfavorable compared to rivals unless luck continues with Watford like Newcastle United.
I too feel that theyll send the bonuses separately to avoid confusion, otherwise people will constantly keep pestering the support for the Watford bonus, but since they havent sent anything yet lets wait and see which option they chose. Also Watford will need to win all their remaining matches to keep up their hopes of staying in the premier league, and further hope that their rivals keep dropping points otherwise theyre bound to be relegated.
I would guess that they will do official announcement about it as well. I mean Watford winning a game is cause for celebration these days, unfortunately we haven't been that well and I really do hope that the future brings more wins but doesn't look like it. Somehow Watford barely can survive premier league, this is like a millionth time they went up, and now going back again so soon, they can't find a way to sustain staying here.
Hopefully there will be a lot more seasons where they have a chance to build a good roster and finally reach like top ten of premier league eventually and be a big part of it without going down too many times in a row.