Now that you have books published, payment from Kindle Direct Publishing always takes around 60 days following the end of the month sales. So the sales made in January are paid out in March, the sales made in February are paid out at the end of April, and so on. So don’t expect any checks for the first couple months. Again, passive income is a long game.
With Smashwords, payments are handled on a quarterly basis. You can monitor your account and the payments coming in from other retailers, but funds will be sent the 20-30 days after the quarter has ended, usually around the 20th.