You can submit your product to be certified during the publishing process. In the Publisher, check the box in the Revit Submission section on the bottom right of the Products and Specifications tab while publishing a product.
The average time from publishing to certification is three days, but during heavy publishing times it can take up to two weeks.
Note that Revit families and other items published as the 3D Models media type are not eligible for certification. If you have published families and want them to be certified, you must publish them as the Building Components media type.