RRU. Remote Radio Head (looks like there are three of them). It's basically a small cellular base station radio. They are fed remotely over fiber optic cable. In this case, the fiber splice is in the cylindrical enclosure to the RIGHT. Probably pulling power off the cable TV trunk line.
So, small cell site.
No idea if it's 5G or not. Without seeing specifics on the antennas or the RRU's, it would be guessing. With three radio heads, it's probably covering multiple bands.
The tags on the pole might tell you who it belongs to.