Where can I see a list of currently available voice commands?
The owner’s manual. More commands are coming — see https://electrek.co/2019/04/02/tesla-voice-command-ai-assistant.
which are the voice commands available in the Tesla Model 3 at this moment? Nov. 2019
The latest Model 3 Owner’s Manual was published on Oct 30, so it should be pretty current: https://www.tesla.com/sites/default/files/model_3_owners_manual_north_am...
The current command list is pretty limited. Details are in the Owner’s Manual in several spots:
Call a contact (p133)
Navigate to a location (p133)
Listen to Internet music (p133)
Activate Sentry Mode (p134)
Activate Santa Mode (p195)
Give feedback to Tesla, ala “Bug Reports” (p199)