This is one of those "new age" phrases that many find annoying.
What it is really trying to get you to do is live and enjoy the "now". We are often crowded out by thoughts and worries in our heads and forget to enjoy the simple pleasures all around us right now.
Often the most mundane thing is pleasurable, but we are too busy worrying to just enjoy it.
See https://www.nhs.uk/mental-health/self-help/tips-and-support/mindfulness/.