2nd Display Support: Dual/Mirroring*. 2nd Max. Resolution: 5120x2880 (5K)*
Details:*. This model supports full native resolution on the interior display in addition to
a single 5120x2880 (5K) display up to 60 Hz or
as many as two external displays up to 4096x2304 (4K) up to 60 Hz.
from:
https://everymac.com/systems/apple/macbook-air/specs/macbook-air-core-i5-1.6-13-retina-display-late-2018-specs.html
Simultaneously supports full native resolution on the built-in display at millions of colors and:
- One external display with 5120-by-2880 resolution at up to 60Hz
- Up to two external displays with 4096-by-2304 resolution at up to 60Hz
Thunderbolt 3 digital video output
- Native DisplayPort output over USB‑C
- VGA, HDMI, and Thunderbolt 2 output using adapters (sold separately)
MacBook Air (Retina, 13-inch, 2018) - Technical Specifications - Apple Support
BUT: it looks like you have only two Thunderbolt ports to charge and run displays. That could be a problem. You might need a Dock or a display that provides substantial Power Delivery.
NB>> The Mac supports TWO displays on one cable ONLY when the Port, the Cable, and the first device (Dock or Display) are all genuine Thunderbolt. USB-C cables support ONE display, maximum.