Good for you. Over a period of several weeks of this, you'll start to see a noticeable difference. But don't feel like there's some huge hurry. Steady on does it. The usual estimate is that it takes ~7 years for a beginning cyclist to hit their peak, no matter their age. The adaptation process is slow. So many changes are happening in your body, real physical changes that you may not yet be able to see or feel. Not to discourage you, but rather to encourage you! Steady consistent effort is the thing. Consistency is probably the thing people have the most trouble with. Year-round, too. No more than a couple weeks completely off during any year is best. If you live in a below-freezing winter climate, a set of rollers with resistance is worth about 10 times what they cost in reduced doctor bills over your lifetime. Maybe 100 times. I bought my set in '94 and they're still going strong. I used 'em today. Yes, we ease off a bit in winter, but never stop.

And use Strava to track your efforts, but ignore the efforts of others. You are the only one who matters. And your loved ones.