I will add a few thoughts. My 1 and 1/4" inch poly line was trenched from the house to the pond about 150 feet before our lawn went in so it was fairly simple process. I have a valve system attached to an older sprinkler timer panel that allows me to set the time the valve opens and how many hours it is open on which certain days. It works well except since it is tied to my house plumbing, I found I can only run it in the overnights due to the amount of water it takes. When it is running we have only a trickle at the faucets in the house and can barely flush a toilet. I have 110 power in a pretty long run to the pond which can run the pond LED lights and some outlets down there. I'm not sure the line is sufficient size to run a 2nd well but ideally i should put a second well down by the pond that can run anytime it needs to.
Lake8, I had a timer like you have in your picture, mechanical timer requiring power. I had issues with the on/off trippers or the internals becoming unreliable. I changed over to a small inexpensive digital timer and found it much nicer because there are more options for how to program it and up to 8 different programs with control over off and on times and different options for which days or sets of days it runs. If your setup remains reliable then no reason to change.
Of course you would have to source a weather resistant model or put it in a weather resistant box. I'm sure if you had WIFI there it would be even easier because you could wire it to an water proof outlet enclosure and to a wifi enabled outlet and control the program on your phone.
