Yeah it should be Monday since it's the 15th and would present a perfect opportunity to release it but since it's stake we are dealing with you never know.
I wouldn't be toooo hopeful, it might also become Tuesday or even Wednesday.
Most important part, as usual, don't play the casino on the release date. For some reason many people always complain on these dates the casino is in collecting mode, getting all the bonus amounts back to the house as fast as possible.
If course that might be nonsense but when so many people experience it there must be something to it.
Looks like we will miss this Monday without the monthly bonus like you said we really don't know when they send it while we can only estimate, but yeah admin will feel uncomfortable seeing the chat room 'when monthly'

let's hope Stake.com doesn't merge it until next month or 45 days. For this one (release date) I agree with you although we can't prove it but sometimes we can feel it and some of my friends also reminded me about this, usually I would skip the first day or just bet on sports betting and live games because I don't think these games will be affected.
.com players should wait with more patience because we will always get it later than the .us players but it is still Monday, still hours remaining before it turn to Tuesday so there is still a chance to get the monthly later today. Talking about the "collecting mode" after bonus is released, I think it is not completely true because sometime I can win after bonus and some other time I can lose quickly. Luck is still the main key of our gambling result imho regardless when we are gambling whether after bonus or before bonus time.