UPDATED! Microsoft has updated the US and international versions of its Where's My Phone Update? pages to reflect the Windows Phone 7.5 update. And guess what? Most phones in most locales are already listed as "scheduling." DELIVERING!
In the US, only Sprint is listed as still "testing" Windows Phone 7.5. The other wireless carriers--AT&T, T-Mobile, and Verizon, as well as open market phones--are all scheduling delivering. (Verizon, annoyingly, is still scheduling the previous update, build 7392, as well.)
Internationally, things are no more complex, which is sort of amazing. The vast majority of carriers in all countries are scheduling delivering, with only Telefonica (Spain) still testing.