I visited this exhibition this past Saturday morning (28 March), with a 0930 entry time.
Due to construction the timed entry lines from up at the quay entrance, down the block from the "old" entrance. There are two lines, one for entry on the hour, the other for entry on the half hour. Check the head of the line for which to queue in. Lines form up early, but if you get in line more than one hour early you'll be sent back. The lines are long, and there's no place to sit.
People without a timed entry queue through a maze near the old entry, across from the Legion of Honor. That's another long line. All the statues that used to be on the plaza are removed.
If you plan to store you coat, bags, etc. the lockers are back by the original entrance. You'll have to walk the length of the museum to do this.
The Renoir Exhibit has two parts, one dedicated to his drawings, which is very interesting as they have studies placed around the finished works. The second part of the exhibit is mainly the paintings, grouped by time and subject. These rooms are the most popular. By 1030 this exhibit was so crowded it was difficult to enjoy a view of any picture for more than a minute.
If you go, don't forget to go up to the 5th floor (the Impressionists section) as they still have the Renoir's from the permanent collection in place up there. Note that this area is also very popular and gets crowded, especially with tour groups and students.
The museum shop, which is "normally" in the area under construction is now spread out into several rooms.