At Roissy Charles de Gaulle (CDG) Airport, you will meet your driver at the arrival gate area.
It means that:
1. you will have collected your luggage
2. you will have cleared customs and immigration
At Orly Airport, you might meet your driver before collecting your luggage, depending on terminal.
Should you need to stop at the wash room or get cash from the ATM, simply ask your driver who will be happy to assist.