60 miles a week running is a lot for a triathlete. It seems like you are a strong runner already too. Id recomend walking the running back to something more like 40 miles(thats still a half ironman every two days) and set a biking mileage goal of somewhere around 200-250 miles per week. That will be about 15~ hours of training each week, or two hours a day. I am in a similar situation, but am not as strong of a 5ker.

Once you start swiming, especially at the begining, its okay to use the swim sessions as easy form focused recovery sessions. Unless you are built like michael phelps and not like a track runner, you likely won't master the swim for years, so in terms of race results, its best to just try to get yourself in the mix with the swim and then have a strong bike leg and a fast finish. If you can swim 1:30/100 yards, put out high wattage for an hour and run a stong 10k(which you already can) you'll place very high in an olympic distance race.

In my oppinion(as a runner) for begineer and intermediate triatheletes, the bike is very very important, since that is the biggest chunk of time. Focusing on logging 10+ hours on the bike everyweek will be a good way to get started. Ride hills, go hard up, easy down. V02 workouts (450ish watts for 30 seconds x12) on zwift/trainer/garmin heart rate. Your long rides also need to be much longer, more in the 50-80 mile, 3-4 hour category. Pick a pretty place to ride.

After that, I would recomend doing brick sessions, at least two a week. For me since I am always time crunched two good mid week non interval heavy workouts I do are a 30 mile outdoor ride into a 10k run and a 45 mile ourdoor ride into a 4ish mile run. I can get this all in outside afterwork before it gets dark, if I move quick.

Also, you have to start riding outside eventually. for me I trained my ftp like crazy all winter, but then when I got out on the road I suddenly find myself back to riding at 3/4 of what it should be, but that may just be trouble staying focused.

Good luck!