Battery Cycle Count is irrelevant unless it is nearing 1,000 cycles which would be considered end of life, otherwise ignore the Cycle Count. If the laptop has been connected to power most of the time, then the Cycle Count will be extremely low, but the battery will still be at least four years old. Physical aging of the battery will impact battery health & function. You do recall seeing expiration dates on the typical AA and other standard batteries used in many home items like remote controls, toys, etc.? Those dates apply even if the battery has never been removed from its original packaging.
If the battery is still performing to your expectations, then you can ignore the "Service Recommended" battery condition until it does become a problem. Unfortunately the "Service Recommended" condition can indicate the battery's Full Charge Capacity has dropped below 80% of its original Design Capacity, or it may indicate the battery has a hardware issue. You would most likely notice a problem if it is a hardware issue.
You will want to keep an eye on when the 2018 model will become "Vintage" since hardware repairs will only be available for "Vintage" items for two years and only if the part is still available. Theoretically Apple has mentioned batteries can be replaced for up to 10 years, but again...only if the battery is still available. Depending on if it is a 15" or 13" model, I would expect a 2018 laptop to become "Vintage" around May of 2024 or 2025 respectively since Apple usually only provides full hardware support for about 5 years.