26.3 and higher resolutions are already available here and will be complete on the day of the update:

ModernArch is one of the most famous and complete resource packs for Minecraft in terms of realistic textures, while being committed to the vanilla look of the game.

Despite the name, this pack is vanilla-friendly and keeps the original colors and characteristics of most blocks =)

It has custom 3D models, resolutions from 128x to up to 1024x, PBR/POM support and more.

Fresh Animations Extension pack

Shader used for most screenshots is IterationRP.