I visited El Calafate in December 2021, where it was easy to arrange a day trip to Los Glaciares National Park.  The trips seem to follow a similar itinerary -- boat tour to get up close to Perito Moreno Glacier, and then a couple of hours to visit the viewing platforms near the park's headquarters.  El Calafate is a much more charming Patagonian town than Bariloche, where I spent a couple of days later in the same trip.