Won't hurt to wax early, won't hurt to not wax now. Unless you plan on doing an iterative waxing using an actual base wax and doing several passes then finishing with a race wax, you can just do it the week or night before your first trip. When I get a board, I take it to the bench grinder and take down the edges. Wax it up and scrape it, unless it's going to be sitting around all summer, in which case skip the scraping. Throw some stickers on it and wait for the snow.