You'll have access to the content immediately! You should visit the program page and work through the "Welcome" module. Part of that includes filling out a survey, that will allow our coordinator to get you set up with your mentor, and the appropriate channels on Discord.
Note that if you purchase an On-Demand Certificate Program that is in "pre-sale" then you won't get access to the content until development is complete! The sales page will include an expected delivery date, and we'll inform you as soon as your program is ready.