Depending on the air temps and how much shade you get, it could be days or weeks until the water is warm enough for the cell to kick on.
Any leftover algae will be waking up during that same stretch and its advisable to be a LC pool until then. 30 mins after mixing get some FC in there. (I choose 10 in case there is 0 CYA left, its SLAM for 0CYA, or its more than min if I retained any CYA).
Overnight Chlorine Loss Test no matter how clear the water may be.
At 24 hours mixing the CYA test is valid, but then you'll have to wait for overhead sun so between the schedule and the weather, it may have to wait.
Once you have the CYA level, manually dose FC as appropriate whether you are slamming or you passed the OCLT and are just maintaining the daily loss.
Whenever the SWG comes online, thank him for his service and let it take over daily doses, already being in range.
The first 2 years at the new place the SWG kicked on 3 days later. This year the temps dropped bad after I pulled the cover so it took a few weeks. You have to roll with it.