If you have an opportunity to sell at a weaned sale later on and you have grass, I would hold on to them. On the other hand, with the sale barn calf numbers being very low since this virus thing started, it would seem logical that there is a lot of calves in the country waiting for any blip of higher prices. Its a tough call.
For me, mine have been weaned three weeks and are on pasture and will stay until the first of June. They will sell then as long weaned calves regardless of the market. When they are ready, they are ready. I don't have any idea if the price will be better or worse but that is about the time the grass starts getting low and the temperature starts getting high.