On April 17, 2018, Microsoft released SQL Server 2017 CU6, which is Build 14.0.3025.34 I count 39 fixes or improvements in the public fix list.
Remember, there are not going to be any Service Packs for SQL Server 2017. We are still in the monthly release cycle for SQL Server 2017 Cumulative Updates which will last for the first year after release. After that the CU release cycle will change to quarterly until SQL Server 2017 falls out of Mainstream Support on October 11, 2022.
As always, my recommendation is to try to stay as current as possible with your SQL Server Cumulative Updates. That doesn’t mean that you should deploy them to Production the day they are released, with absolutely no testing, but it also doesn’t mean that you should not make any effort to stay current. Try to find a deployment cadence that makes sense for your organization.