The answer that will work for today is, Yes. At least for Thomas County. I don't know about Sherman. As of today, I can listen to Thomas County Law Enforcement on my digital trunking scanner. I currently have my scanner locked on Thomas County. If you need to know about Sherman County before you buy a scanner let me know and I will monitor their channel if they are using the Statewide system that Thomas County is using.
Soon the Fire Departments (Colby, Thomas County Rural, Gem, Rexford) in Thomas County will all go digital. As I understand, the EMS will also switch this year.
Thomas County L.E. got new equipment last year and have the capability to go from P25 Phase 1 to P25 Phase 2. Their new equipment will also let them go to encryption (scrambled) which means if they make that decision then even a new digital scanner will not be able to listen to them.
If you buy a new scanner, you may want to spend the extra for a Phase 2 capable scanner.