Indeed, you can register for any desired level right away. Gold/Platinum-tier registrations are typically processed faster than 24 hours.
However, kopbjo, I was unable to locate a request for a Platinum registration under your username...
I just applied for the Lite version, as I thought I had to to so before upgrading to Platinum. Apparently, I was wrong
Now I've donated - and hopefully done it the right way!
Cheers,
/Kopbjo