Tilray only announced the launch into the US recently. Usually a product launch announcement is only made after the actual launch has been in place for a few weeks. This allows companies to work out ordering kinks and to monitor for issues they may have overlooked prior to having a flood of people trying the product or trying to order.
If you research "cannabis infused drinks conference " in YouTube you can find some good videos that include interviews with people involved (and yes, invested) in the space.
If you research "Pepsi Germany cannabis drink". You will find that Pepsi has been exploring cannabis drinks overseas, likely with the intention of a US launch once regulations allow.
If you research "2018 Coke Cannabis infused drink" you can find material regarding coke's initial interest in exploring these drinks as well. Coke is an extremely secretive business with virtually nothing more being heard from them since a Canadian cannabis company announced to the world what was going on.