wa 'alaikumussalaam wa rahmatullaahi wabarakaatuh akhee,
JazaakAllaahu khayraa for this important information.
Based on what you mentioned about having to wait till the next day to slaughter, brothers would do well to contact whoever they pay to take care of their sacrifice so that they can know when exactly their animals are killed as this may have an effect on the time they can actually leave the state of ihraam.
Allaahu 'alam.