Hi Larry011,
The time it takes for your photos and videos to upload to iCloud depends on the size of your collection and your internet speed. The best thing you can do is stay connected to power and Wi-Fi overnight to let them sync. Low Power Mode will pause iCloud Photos from syncing. This article explains how to turn this feature off if needed: Use Low Power Mode to save battery life on your iPhone or iPad
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To turn Low Power Mode on or off, go to Settings > Battery. You can also turn Low Power Mode on and off from Control Center. Go to Settings > Control Center > Customize Controls, then select Low Power Mode to add it to Control Center.
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Take care.