We did Edge Panama Canal in March. All comments above are accurate and let me add some commentary
1) there are 2 sets of locks, one for larger ships and one for smaller ships. Beyond will be using the large ship locks
2) If you have access to the Retreat area (front) of the ship, you’ll have a nice view. If not, you’ll only be able to have a side and back view when going through the locks. This is the downfall of E class ships doing Panama Canal
3) If you’re on an excursion, you will go through the locks with the ship from about 6-9am, then get off the ship to meet your excursion. However when you reconnect with the ship, it will be after the ship has went back through the locks so the only chance you’lll see the locks is in the morning, unless you don’t have an excursion