To see what races will be broadcast you will need to be on the desktop site. (To reach the desktop site from a mobile device tap More then Go to Desktop.) Click on Racing Schedule under the Racing tab.
You will now see a list of upcoming races. Their broadcast status will be listed to the right. In the example below you can see that Saratoga Race 8 will be shown on TVG, Louisiana Downs Race 3 will be shown on TVG2, and Scioto Downs Race 11 will not be shown on either channel.
Please check out the broadcast schedule updated here:
https://support.tvg.com/hc/en-us/articles/360058687514-TVG-Daily-Broadcast-Schedule