How do I detect the new topbar before the Inset loads

Help and Feedback Scripting Support
1

Really important, I need to be able to detect whether it was rolled out to a play so I can delete the topbar (possible only with the new topbar, breaks the game with the old one)

2
How To: 
if GuiService.TopbarInset.Height > 36 then
Return 'New'
else return 'Old'
3

that doesnt work for the reasons ive stated above