its ok to charge when you are using your macbook air m2?

Yes, that is perfectly fine.

Also see the information in Charge the MacBook Air battery - Apple Support including the following about optimized battery charging which is useful if you want to leave your MacBook Air plugged in for long periods of time:

• Optimized Battery Charging: This feature helps to reduce the wear on your battery and improve its lifespan by learning your daily charging routine. It delays charging the battery past 80% when it predicts that you’ll be plugged in for an extended period of time, and aims to charge the battery before you unplug. You can change this option in Battery preferences.

The 99% should slowly drop to 80% as you use the MacBook while the charging is on hold.

Also see: If battery charging is paused or on hold on your Mac - Apple Support