Yes, reserving is available in advance at certain locations.
To reserve a seat in advance, tap the top-left button on the 'Discover' tab to access the filters. From there, under Reserve Seat, you can select the Date, Time, and how many Persons you'd like for your future hold.
Then, when you click through to a workspace, you will see a large button at the bottom to place your future hold. To see all your holds, you can go to the "Seat" tab.
You can also hold a seat for 1-hour while you commute to the coworking space. Simply select the space on the app and click 'Reserve Seat'. It's a great way to ensure your seat when you arrive.