When will this keyboard go on sale?
For an active project or one in preparation, this is written in the product page, IC/GB thread, or similar specific to the product. Please check such sources.
If the group buy has occurred in the past and is already completed, the board will not go on sale again unless there is another round of sales.
If the ETA is not written or marked TBA, there is no known time when the board will go on sale.