Dave R: I would install the standard inner covers now. Most heat loss is through the top of the hive. Temps at night are now 50 and below which is lower than non brood bearing colony temp. Make sure you use an inner cover that has a least one vent/exit hole cut in the front side rail. As you go into winter that side should be facing down. Facing down, it provides some venting at the top front of the hive. You can then also cut 1" thick pink XPS and place it on top of the standard inner cover followed by your telescoping cover (if it has sides long enough to extend down to cover the XPS. If you do add the XPS make sure you put a good weight on the hive top so it doesn't blow off!!
At this forum link you can see a somewhat similar scheme that we use for insulation: https://tvbabees.org/Topics/9192575#9214155