@oVerdoZzZed, Guten Morgen! Happy to help any way I can man.
Regarding the training time, I think whatever works best for your schedule. You definitely do NOT want to do these sessions fasted, so as long as you've had at least or meal or two already I think you're good. If possible, for the sprint days, maybe late morning or early afternoon, so you can get some great fat burning throughout the day, rather than training in the evening.
Regarding meal timing, again as long as you have at least a meal or two in you before the training session you're good. Have a Mag-10 if possible immediately after training, and then a meal 45-60 min or so after that. Generally if you space your main meals out every 2.5-3 hours you're good to go.
If I remember correctly, I think I wrote that the 5/2 diet wouldn't be good for those already on a very low calorie diet, because you won't really get the metabolic effect of the two low days if you're not providing sufficient fuel on the other days. I think if you're already lean, the 5/2 would actually be a great diet to ensure you can train hard, get the proper fuel for your training and growth, and slowly chip away at the remaining fat.
The "gold standard" for efficient fat loss is roughly 1-2lbs a week. When you start a fat loss plan, it'll probably be closer to 1.5-2lbs a week as you lose water and your body has its initial response phase. As you get leaner and keep dieting, it may be closer to a pound a week or even less, but as long as you're no more than 2 lbs a week, you should be good. Any more than 2 lbs a week is a good possibility you're losing LBM as well, and of course the priority for any diet is to keep LBM and lose fat. If you're already pretty lean, be sure to keep an eye on body composition, and not just scale weight. Take pics if you can weekly and evaluate. If you gain a little muscle and lose a little fat, which is entirely possible, the scale won't move but you should notice some good physique changes if you're lean enough.
Hope this helps, keep us posted!