Elytra HUD
Also compatible with Elytra Slot (Only for 1.20-1.20.1 and 1.21-1.21.1)
This simple mod adds the remaining durability percent in the HUD while using elytra.

While you are flying, if the durability falls below 4.6% (Around 20 seconds of flight time remaining), a message appears to warn that the Elytra is about to break.

To edit the config Mod Menu is required.
HUD config:

Low durability message config:

How to Install Elytra HUD (Mod)
Elytra HUD by Apollo_2040 is verified for Fabric across Minecraft versions 1.20, 1.20.1, 1.21, 1.21.1, 1.21.5 (latest release: 3.0.1-a, file size: 20 KB). Follow the steps below to install it safely from ModCraft.tv:
- Click the Download button above and select your Minecraft version (1.20, 1.20.1, 1.21, 1.21.1, 1.21.5) and platform (Fabric).
- Make sure you have the compatible loader or environment installed for Fabric.
- Move the downloaded Elytra HUD file into your Minecraft
.minecraft/modsfolder and launch the game.