The surveys should be going out to everyone at the moment. If you're not seeing it in your inbox, check the spam folder for emails from Backerkit; sometimes the Apple mail and protonmail in particular will automatically segregate Backerkit messages to spam. The surveys are particularly important if you got one of the box kits; I'll need to make sure I know where to mail yours to!
I'm getting all the digital materials uploaded on the hosting site at the moment, so I'll be posting another update in the next week to ten days once all the processing is wrapped up notifying you when the access emails emails go out.
Very exciting stuff for us; my kids have already been having a blast with King Arthur coloring pages and story times!