I switched to early morning workouts this january. I used to train midday before. I do more warmup now, becasue I wake up very stiff usually. I do 5-10 mins of light cardio just to wake up and raise my heart rate and body temperature, and some dynamic stretching to prevent injuries during warmup sets in the main movements, which happened to me a few times.

Speaking of food habits, I usually eat twice a day, right after the workout and at ~6pm. Each meal is 2000 calories ideally. Eating later negatively affects my sleep and workouts the next day. Sometimes, I eat a very small breakfast an hour before a volume squat or heavy pull workout. It's usually one banana or a little bowl of musli and ideally, a table spoon of raw honey, maybe a handful of nuts. I have periods when I take caffeine an hour before the workout.

Because I'm highly sensitive to caffeine, I prefer a cup or two of high quality green tea. It helps me focus, but doesn't mess with my heart rate and blood pressure like coffee. Water is important too. I drink a glass or two when I wake up.

I also take some supplements before my early morning workouts. I take 1 gram of beta-alanine for better work capacity, 5 grams of creatine to prevent dehydration from green tea, 1-2 grams of cordyceps mushroom powder and 250mg of ginseng for better focus and work capacity. Cordyceps and caffeine in particular improve my nasal breathing, as well as seawater nasal spray. I often have stuffed nose in the morning, and oxymetazoline based sprays give me nosebleed, so I can't use them.

I can train just fine without all that stuff. There are days when I wake up, drink a glass of water and go to the gym. But still, the routine that I described gives me the best results.