First ESA payment and due date

Hi all, I have recently been moved from IB to ESA, my IB was due every other Monday but because of my bank (NatWest) it was always in on a Friday they process Monday payments on a Saturday morning normally but it was always in on Friday.

I spoke with the ESA department on Wednesday and was told that my payment is due to go out that evenening overnight, it too is due on a Monday, I have checked my bank today and nothing is there, I know im not even due till Monday but I thought that nothing went in on Mondays unless faster payment ect. Has anyone else been in this situation, its just you hear of all these payments being days and days late and as its my first ever ESA payment im a bit concerned,

any help would be great
many thanks