No, 5 is actually fairly high considering how few Lightnings are being built in 2022. 48 may not be too bad for 2023 but we don't know for sure.
I recommend you start by reading the Dealer's Playbook. It explains how the dealer prioritization works.
2022 F-150 Lightning Delivery Dates Updated In Dealer...
This leaked 30-page Ford dealer playbook on preparing for the F-150 Lightning order bank opening reveals some interesting info. Like how Platinum and Lariat models will arrive Summer 2022, while the XLT is set for Fall 2022 and lastly the Pro in Fall 2023. It also lists pricing that seems...