They cannot touch tomorrows open time prior to 0800 base time. They can and will assign it after that.
The reserve list for the following day is populated after the 0700 PCS run, and when that run is done, you can see where you stand on the reserve bucket. You can also look at the open time pot to see if you will get assigned a trip, and then yellow slip accordingly.
Anything that arrives in the pot after 0800 for the next day can be assigned at the schedulers discretion.