I applied in June and found out by end of December. The mention on the website that it takes approximately 6 months. You can call the contact lady, she is very nice, she will tell you whether or not you were approved.
I don't know what an RPB grant is, but I just looked on their website and it seems it's really hard to apply/get accepted. Does the grant just give you a ton of $$$ for whatever project you're working on?