I had a second round postdoc interview (and presentation) on Friday at a prestigious UK university. They seemed very pleased with my work and they stated that my research is in line with the needs of the project. The interview took longer than it was supposed to and I was even told that they have postponed the next interview by 10 mins, as they found my work interesting. At the end of the session, I was told by the PI that they would let me know of the outcome next week (i.e. this week), which he quickly corrected himself by saying that they'd let me know on Monday (today).
I spent the entire weekend feeling very confident of having secured the position; however, after not receiving any emails today, I have started questioning said confidence (e.g. that they may have gone with another candidate). Is it too early to be disheartened? Would it be appropriate to send them a polite email and ask about the status of the interview outcome?
I understand that technically only one working day has passed since the interview; but I was told by the PI that I would be informed today (which I took as a sign of their interest in me), and as I have not heard anything, I have become somewhat paranoid.