Ulsterbus operates the following:
From Belfast
0600 0700 0800 0900 1400 1500 1600 1700

From Dublin
1000 1100 1200 1300 1800 1900 2000 2100

Its only anticipated 3 will be allocated. However, if drivers aren't trained on the Ayats they may refuse it. It may take a few weeks to settle down.
Theres talk they may appear on the Dublin-Derry route soon as well.