Sounds legit, maybe they put the endeavour thing there in case it takes them a few days longer. Looks like you have one though, congrats!
After months fruitlessly checking stock every morning I decided to spend a couple of quid on an app that gives stock alerts as soon as they're in stock because if you don't get to a site selling them within the first minute (or in some cases the first few seconds) then you've no chance at most places. Got an alert from Argos in the middle of the night and managed to bag one a few weeks ago. If you're spending 450 quid then an extra couple of quid on an app is worth it (this is more for anyone else trying to get one as sounds like you're sorted now).
Edit: Just realised "sounds legit" is usually said when something doesn't sound legit, but it really does sound legit.