Opportunistic feeders, their diet varies from one region to another. In the Antarctic, killer whales eat about 67% fishes, 27% marine mammals, and 6% squids. Killer whales in the Bering Sea (near Alaska) eat about 65% fishes, 20% squids, and 15% marine mammals.
Even though your shower grout looks dry, using it too early or sealing it before it's ready may damage it, leading to premature failure. Most cement-based grouts require a cure time of 48 to 72 hours before applying a penetrating sealer.
Grout the Tile. Then you want to come back and grout the tile, and then after you grout it, you need to wait 24 to 48 hours before that's cured. Then you come back and seal the grout. You probably want to wait 48 hours before you have any foot traffic on that.