Maximum Bandwidth. Maximum bandwidth in the HDMI 2.0 specification is 18Gbps. This bandwidth allows for support of 4K video resolutions at a higher refresh rates with more detailed color information than previous HDMI specifications. This configuration will also support advanced audio streams.
To connect a PC or laptop to one monitor only, and the monitor has both a DisplayPort and HDMI input, use either. DisplayPort might be best as it is optimized for PC use. To connect a PC or laptop to a TV, where the TV only has HDMI inputs, and where the PC has an HDMI output, use that option. If the PC or laptop only has a DisplayPort output

I have a 60hz 4K tv with HDR but the HDMI version is only 2.0 and not the upgraded 2.1 XSX offers. So l started worrying if l can still benefit of 4K/HDR/60 FPS or am l going to only get 4K/HDR/30 FPS. Web search doesnt mention HDR bandwidth requirements anywhere afaik. Yep! It is sufficient enough but will do some weird things to color that

Freesync is a 3rd party technology. We officially support the industry standard HDMI variable refresh rate (VRR) over HDMI 2.1 specification on GeForce RTX 30 series and above." You can't with an Nvidia GPU. Connect it via DP for G-Sync. HDMI 2.1 does support G-Sync, but the 2080 doesn't support HDMI 2.1.

Generally speaking though, if it has HDMI 2.0 yes it should be able to do 4K 60Hz 4:4:4 but it is best to know the details for the TV set you are interested in purchasing. Like others mentioned you need a GPU which can output the proper signal too, so a GPU with at least HDMI 2.0, preferably 2.0b.
Expanded HDR support: While Dolby Vision, HDR10, and hybrid log gamma are compatible with HDMI 2.0a/b, HDMI 2.1 supports any forthcoming HDR formats that may not be supported by HDMI version 2.0a/b. Audio support: As with HDMI 2.0 and 2.0a, all surround sound formats in use are compatible.
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does hdmi 2.0 support hdr