Maybe others know better, but I started my SWCG within a week of opening the pool. Yes the calcium levels were high from the plaster, but this did not visually cause increased scaling on the cell. The heater (I have the same model as you) I did not use right away because it was not necessary, but I would have used it also after a week of balanced water.

I also have a hint that might save you some money on heater repairs. The electronic circuit board in the control panel on my heater corroded after 1 season. The cost to replace just the panel is over $500! This is about 1/3 the cost of the entire heater! Luckily, mine was replaced under warranty. What I am doing this year is when the heater is not being used, and after closing for winter, I remove the panel and store it in a cool, dry place. The connectors on the back are plastic plugs that can only be reattached in the right place, so they are fairly idiot proof (which is good for me).

I hope this will make the panel last much longer.

Good luck.

33k gunite rectangle
Aquarite SWCG
Laars LX400 natural gas heater
Triton II sand filter