Given that the OP 3-series was updated to 8.0 (Oreo), it seems HIGHLY likely that they'll update the 5/5T to P.
Probably not the treble-enabled version, unless they choose to try an OTA re-partition, but at least OP is updating things.
I'm STILL waiting for 8.0 on my tablet, an S3 Tab, which was *supposed* to get it "early this year".