Once your job has been accepted, you will be sent an email and app notification - You will be able to see who is coming and when.

The job will note the Date and ETA. The ETA will have a 1 - 3 hour window depending on the category. You pro will arrive any time in this time window.

Check your ETA and pro info:

App: Click Job (bottom menu) --> Click on your request (under active jobs) -->  Eta and date are listed first: