Artificial intelligence (AI) stocks have been the must-own stocks over the past few years, but we're still a long way away from full AI deployment, so many AI stocks are still worth buying, even at their current levels.At the top of my shopping list are Nvidia (NVDA 0.87%), Taiwan Semiconductor Manufacturing (TSM -0.19%), and Meta Platforms (META -0.29%). These three each tackle AI in their own way and could be excellent long-term investments. NvidiaNvidia makes graphics processing units (GPUs), which are w ...