Link for anyone who needs them. There are two Instagram presets. Wide with 16:9 Aspect ratio and the other is Square aspect ratio with HD resolution of 1080×1080 or 1:1 for IG
If they helped you say thanks @ProjectileObjects on IG
Download and extract the zip file.
Info to install here: https://helpx.adobe.com/media-encoder/using/custom-encoding-presets.html
Works for Adobe Premiere Pro, After Effects, and Media Encoder. (CC2015+, but should work for almost any version.)
Example of Wide 16:9 here: