There is no average time at CDG immigration. On a recent trip, I was the second person to arrive at Immigration with no line at all. Immigration took seconds. Other times I have waited up to one hour. There are simply too many variables to be able to anticipate any specific time required.
The current Covid protocols only require visitors to have 2 shots and an mRNA booster (with some minor exceptions).
For transportation into Paris, use taxis (not VTCs such as Uber), and take advantage of the fixed fares of 53€/58€ to the Right Bank (le Louvre)/Left Bank respectively. Do not accept rides from clandestine drivers, proceed to the official taxi queues. Taxi drivers are not tipped.
Traffic into Paris on a weekday morning can be horrendous between 7h00 and 10h00. I would allow at least 60 minutes for the taxi, maybe more if it is raining. If you have a 07h00 scheduled arrival, I should think it very unlikely that you could be at le Louvre by 09h00.
However, if you arrive on time, the line at immigration is short, you receive your luggage quickly, and you really want to try for a 09h00 rendezvous at le Louvre, get a quick ticket at the RER station, 10.30€, disembark at Châtelet, take either métro 1 or métro 7, whichever you find first, as they both go to the Palais Royal/Musée du Louvre métro station, and see if you make it. This route should take about 45 minutes.