There is no schedule that is reliable and therefore GA Power does not release one to the public. The best efforts to guess at what may happen is to know the lake level and the desired level and compare the release level on the guage. It is guess work from there on.
Lake Level here: https://lakes.southernco.com/
Desired summer level 528.00 effective now. Lake level now 529.54
What this tells you is that they need to get water out of the lake, so they will be releasing more than is coming in until they get to 528 then they will generally release only the amount coming in or the minimum they can release which is about 1000 cu/ft/sec. that results in about 3.9 ft on the guage. It will almost never be less than that and fishing is safe if you know what you are doing up to about 5.2 on the guage. It gets more dangerous as the flow rate goes up.
Here's the guage http://waterdata.usgs.gov/ga/nwis/uv?cb ... o=02210500
Currently releasing 2600 cu/ft/sec and likely will till the lake gets down to 528. The guage level is 5.39, a little high for my tastes. I would forget it till it gets steady somewhere under 5 feet.
There is a public canoe launch/takeout at Pioneer Timber where you can get out ahead of the most dangerous places which I have had to do more than once, but I have been caught below there a few times with water coming at me as high as 7 feet and I don't wish that on anybody. Scary to me.