It's available. It's just not obvious.
Select a ship or fleet, hold down one of the CTRL keys, move the cursor to on open tile. The number of moves and time in weeks (turns) it takes for that ship or fleet to get there will appear.
Also, that line in your screenshot has numbers that show how many turns it takes to get there and is updated as the ship moves.
Thanks for the clarifications, that is good to know. I did later realize that the turn pips had numbers on them, but the player has to zoom in quite a bit at the last pip to see the total value. Fine when you have already set a destination and the ship has been underway for a while, but less useful on the first turn when right clicking the destination will trigger the ship to move before you know the number of travel turns. Your CTRL key tip will help though, thanks!