If you apply now, you are likely to be rejected for insufficient content.
More content is usually better. Although, there isn't a specific amount of content that AdSense requires, it appears that they are not as concerned with number of Hubs as total content. So a bunch of short Hubs might not work as well as fewer longer and more in-depth Hubs.
I think a month and 15-20 featured Hubs of good length could be a good starting point.
Keep in mind that Google AdSense has requirements that accounts form some countries be 6 months or older before an application is approved.
Please keep in mind that since we are not privy to the entire Google AdSense application process, all of our suggestions are guidelines and should not be taken as Google gospel!