Mortal Kombat 1's Towers tab doesn't work the same way as past games. You'll see numbered towers that lead to story endings for each character, but none of the everchanging timed ones. Those are now found inside the Invasions mode.
For context, MK11 had a rotating pool of daily, weekly, and hourly towers to earn cosmetics and consumables (sorry, konsumables). These could be viewed in the Towers tab in a void where you could cycle through them. Mortal Kombat 1 has a similar mode, but it's accessed via the Gateway Portal in Invasions. And instead of having them all laid out in front of you, you have to walk to them across a board.
You can find spots that take you to the hourly, daily, and weekly sections, navigating much as you would in typical Invasions gameplay. And since it's tied to Invasions, you also get XP for the mode, and your character level impacts how strong you are. Konsumables are also shared, so you can bring your armour and damage boosts to make things a little easier, or earn them in the towers for elsewhere.