Do you guys have a regular drop off time? I'd state the time you'll drop them off or ask when your wife would like them home by? Just a courtesy thing. The rest of your message looks good. No BS.
Me: 31, W: 29 T: 4 M: 2 Kids: 3 (SS: 7, SD: 4, D: 3) Separated, still living together: Nov 2013 Separate bedrooms: Feb 2014 W working away; kids with me: Nov 2014