• How quickly do 500-mile electronic upgrades / stickers post to my account?

Earned upgrades post an additional 1-2 days after the flight crossing the next 10,000-mile increment posts to your account (which was historically 2-3 days after completion for AA flights but is now generally immediately following AA flights). Upgrades purchased online are available for use in approximately 2 hours, but may not post to your account until the following day. Upgrades purchased at kiosks are available for use immediately.

AA.com: 500-Mile Electronic Upgrades Terms and Conditions
FT: How quickly do earned 500-mile electronic upgrades / stickers post?
FT: How quickly do purchased 500-mile electronic upgrades / stickers post?