Yes, You Can Poach Eggs Ahead Of Time - Here's How To Store Them - Tasting Table
Briefly

Poached eggs are often viewed as difficult to prepare but can impress when made correctly. They can be stored for up to two days submerged in cold water in the refrigerator. To warm them before serving, heat in water at 140 to 150 degrees Fahrenheit for 1-2 minutes. Adding vinegar to the poaching water helps the egg whites set quickly, ensuring a neat shape. Techniques like swirling the water or using a strainer enhance the poaching process.
Poached eggs can be safely stored for up to two days in the refrigerator, as long as they're kept submerged in clean, cold water and the container is properly sealed.
Place the egg in water heated to about 140 to 150 degrees Fahrenheit for 1-2 minutes, just enough to warm it through without cooking it further.
The pH drops when vinegar is added to water and denatures some of the protein, which helps the whites set faster and, in turn, hold their shape.
Transferring egg whites into a strainer can also help achieve chef-quality poached eggs, free from excess or stringy whites.
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