Hi @Ben09 welcome to the /e/ forum. Yes the Smartphone selector is up to date.
In a quick search I did not find any custom ROM for Redmi note 10s, but I did find this, https://forum.xda-developers.com/t/firmware-redmi-note-10s-rosemary-auto-updated.4294971/#post-85738323, where yshalsager says “rosemary/maltose/secret ROM/Firmware is the same.”
When looking for a Custom ROM always best to include your device-code in your search - the AIDA64 app is another way to find device-code https://www.aida64.com/downloads.
… or without a specific build currently in the pipeline, you might check out installing a GSI Introducing /e/OS Generic System Images (GSI)