Use phone + watch setup for biking

I'm trying to use my phone while biking to mirror the activity I started from my watch. I've read people starting an activity on Strava to have their phones and on their watches and then deleting the Strava activity. I'd rather not do that.

I came accross a third party app called Bike Connect, but there's very limited information on it. As anyone tried it ? Does it work well? If not what do you do for this. I'm not in a place to get a proper Garmin cycling computer at the moment