The charger for the Tic Watch Pro gives no indication of when the watch has finished charging.
This Tasker project overcomes that shortcoming as follows.
It detects when the watch is on the charger and then, every 15 minutes, it provides a notification and flash on the phone as to the level of charge on the watch. Once the level of charge reaches 100% then it also speaks "Watch battery fully charged". Thereafter it will repeat the announcement every 15 minutes until the watch is removed from the charger.
Watch Charge Notification 1.0
Know the state of charge and when it's done