CEF loads too early compared to GTA loading — how to detect full game readiness?

[NextLogin]

Hello,

I have an issue with CEF in RageMP loading too early.
Currently, I start the CEF browser when I receive the playerReady event. However, it seems that GTA/Rage is still loading resources at that moment. As a result, before my MP character fully spawns, I briefly see Michael and the UI appears immediately.
I want to prevent the UI from showing until the game is fully ready (world and MP character loaded).
I suspect the issue is related to the fact that a large amount of resources (~2GB) is being loaded from:
client_packages/game_resources/dlcpacks
Rage/GTA is still processing DLCs and other assets even after the playerReady event is fired.
Question: Is there:
    a reliable event that indicates the game is fully loaded?
    or a way to check the real loading status of GTA/Rage before showing the UI?
I am looking for a solution that can handle large DLC packs (models, maps, etc.) and ensure the UI only shows when everything is ready.
Thanks in advance for any advice.