I am using LEDE 18.06 on my TL-WR902AC v1 and on OpenWRT-Homepage you can read on Roadmap: "6 July 2018 - Final release binaries available for v18.06.0"
What can or must I do to get these binaries on my TL-WR902AC v1? opkg update & opkg upgrade or something else?
They‘re not available yet.
O.K. you are right, it has been changed. Now you can read there: "20 July 2018 - Final release binaries available for v18.06.0"
But my question was: How do I get these "binaries" on my device?
Same way you got the current build on your router -- by flashing a new binary onto your router.
Binaries = firmware? O.K. Thank you very much.