There's been one at Barnegat Light, Ocean County NJ trying to over-winter in January. It's an unusual year for migration. These birds on this particular flyway probably didn't travel too far south, and so returned early.
Here's an interesting read:
During the non-breeding season (winter), paired Ospreys do not spend time together
After the young of the year leave the nest, the female begins to migrate south. As long as a month after she leaves, the male starts migrating south, and each bird settles in separate regions in the wintering grounds.
A mated pair will not see each other until the following breeding season.
Young ospreys migrate separately as well. The Young of the year may remain together for a few weeks and begin migrating south at different times, covering different distances, and settling in other places.
As birds migrate south, they settle in a wide variety of areas, ranging from South Florida and Mexico to the extreme southern tip of South America.
When it is time to return to the breeding grounds, the male departs and arrives first. About a week later, the female arrives from where she spent the winter.
Juveniles that migrate south for the first time stay the first year in the wintering areas and return the second spring, about 18 months later. Then, they are ready to breed for the first time. On rare occasions, juveniles return during the next spring after hatching, but they do not breed.
https://avianreport.com/osprey-migration/
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