The only thing which is more likely in this scenario is that you will get selected for a secondary inspection at your departure airport (the famous "SSSS" on your boarding pass). When you do an online checkin and you don't get a boarding pass at that time, you know that this happened. I personally would make sure that i arrive a bit earlier at the airport just to not be stressed if security takes a bit longer.

The only thing which is more likely in this scenario is that you will get selected for a secondary inspection at your departure airport (the famous "SSSS" on your boarding pass). When you do an online checkin and you don't get a boarding pass at that time, it might be an indication that this happened. I personally would make sure that i arrive a bit earlier at the airport just to not be stressed if security takes a bit longer.