I have a quick question! I'm a USA citizen, and I've been working in Canada in a permanent position for the same organization for 18 months. My current work permit is expiring soon, so I applied online to get an extension. However, it does not look like I will receive the decision before my current permit expires. What happens in this situation? Thank you in advance!

If you had filed for an inland extension prior to the expiration of your work permit, then your status and ability work work in Canada remains intact under the implied status provisions.