As an ADC main, I'd say it's important that the adc knows wave management at least to a certain degree to allow you to gank. If I see my support roam, I immediately let the wave push into me, in the best case I'd even establish a freeze.

Since most ADCs in bronze have no clue how this works, I just wouldn't risk the tilt of your adc.

If you still want to go for it, wait for your adc to be ahead and then either go from base or move up there when the wave crashes into turret or your adc recalls.

You need to measure your opportunity cost. If you leave to go for a gank and your ADC has just returned to lane, you will leave them in a 2v1 for 2 minutes. If you can desync your resets and your ADC can put the wave in a good spot before you leave it's not as bad, but leaving the ADC alone just opens you up to get punished for leaving, making your attempt at q gank a neutral or negative play with no positive outcome. Typically getting gold and XP on your ADC is more important than anything you could have gained from the gank since you can get dragon by making pressure bot.

Generally speaking, you want to roam when the wave is pushing towards you. Having the wave push towards you means that your ADC will lose few to no creep while you roam.

One common roam timer is after you and your ADC crash the wave into the enemy bot turret and recall, you can walk mid to look for a gank or countergank. If there is no opportunity, just walk from midlane back to bot, since the enemy could stack waves via slow push and dive your ADC if you stay away too long.

Do not roam when the wave is slow pushing towards the enemy tower, that's when your ADC can get zoned off all farm and xp.

As someone also in Bronze who plays ADC/Jungle I'll often try to push up and ward around blue/gromp if I'm blue side or if I'm red side I'll try to get a ward around krugs or back of dragon pit. I do this for vision but also in the hopes we can catch their jungler out.

If I'm behind I'd rather the support stay unless the lane is far lost and then I can understand the roams. If I'm up, hell yeah go for it if it's there, nothing wrong with trying to make a play there.

It’s often a good idea of just walking mid for a gank after both you and your adc recall. It doesn’t take that much more time to walk from base to mid to bot than it does to just walk bot. If the gank doesn’t look good just head back bot. This timing lowers the risk of your adc dying as they won’t be alone as long and will be full on HP