These aren't available until the build actually begins. Once the truck is going down the line/is built the build sheet will be available later that day or the next, and once the truck leaves vendor install (for anything like bedliner/running boards etc..) and has an estimated ship date, the window sticker will become available in the same timeframe that the build sheet became available.
So not strange at all, this is how it is for every ram built and how it was when mine was built last May as well. In the meantime the POC is meant to be your information, and if you have the tentative build date you can keep an eye out for your build sheet and window sticker yourself using links provided on this forum.
I ordered a 2022 3500 Limited Longhorn back in January. I got the initial email “welcoming” me the Ram family on 2/20 and just got another email stating “At this present time, your vehicle is being sequenced for production”.