I'd be apprehensive about doing it in the daytime; I've done it at night with no problems, the only time I had a mama reject a chick was when I tried it during the day. When you do it at night the chick goes to sleep under the mom, and cheeps a bit. Before an egg hatches, the mom and chicks actually communicate;
this kind of mimics that.
You don't want the broody to see the chick you're handing over as an intruder,
doing this at night minimizes that risk.
Then the mama wakes up in the morning with a little baby under her, she thinks she hatched it, and it's all good from there; you just gotta wake up early to observe and intervene if for some reason she doesn't accept the chick.
Seriously, there's no good reason to do it during the day;
chickens are like zombies at night, and it's much easier.