Indeed,The MacBook Pro , MacBook Air models really do not have an onboard Ethernet port. However it is possible to connect to wired Ethernet network with an adapter.

The best buy USB TYPE-C to RJ45 adapter at 1000Mbps speed . for connecting to the Internet in Wi-Fi dead zones, streaming large video files, or downloading a software upgrade through a wired home of office USBC Ethernet; Ethernet to USB C adapter provides faster data transfers and better security than most wireless connections

USB Thunderbolt 3 Type C to RJ45 Gigabit Ethernet LAN Network Adapter with 1 Gbps High-Speed Internet USB-C to Ethernet Adapter , click the picture belowing , lead you to the online shopping of MSLFORCE . Quality guarantee & fast shipping & money back

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Compatible list no full-list here :

USB-C & THUNDERBOLT 3 port compatible USB C network adapter for the 2016/2017 MacBook, MacBook Pro, iMac, iMac Pro, Acer Aspire Switch 12 S/R13, V15/V17 Nitro, TravelMate P648, Predator 15/17/17X, Chromebook R 13, ASUS ROG GL/G5/G7/GX/Strix, ZenBook Pro UX501VW, ZenBook 3 Deluxe/Pro, Transformer 3 Pro, Schenker XMG, Q524UQ 2-in-1 15.6, Chromebook Flip C302, Gigabyte Aorus X5 15, X7 DT 17, BRIX/BRIX S, Razer Blade/Stealth/Pro, Samsung NP900X5N, Notebook Odyssey, Notebook 9 15 Inch

USBC TO ETHERNET adapter is also compatible with HP Elite X2 1012 G1/G2, Z1 Workstation G3, Spectre 13.3/x360, EliteBook 1040 G4/X360 G2/X 360 1020 G2/Folio G1, ZBook 17 /15 /Studio, Envy 27 All-in-One, Microsoft Surface Book 2, Lenovo Legion Y720, IdeaPad Y900, Miix 720, ThinkPad P 50/70, T 470/470S/570, X270, X1 Carbon, X1 Yoga, Yoga 370/900/910, MSI Phantom Pro, Ghost Pro, Stealth Pro, Titan Pro, Dominator Pro, Vortex G65, LG Gram 15Z970, Intel NUC6i7KYK/NUC7i5BNH/NUC7i5BNK, Sony VAIO S11

USB Type C to Ethernet adapter is compatible with popular Dell models with Thunderbolt 3 including the Dell XPS 12 9250, 13 9350/9360/9365, 15 9550/9560, Latitude 5480/5580/7275/7280/7370/7480/7520/7720/E5570, Precision 3520/15 3510/5510/M7510, 17 M7710, Alienware 13/15/17