Harry Smith was announced as signing a contract to return to WWE but that was a couple of months ago and nothing has been heard of him since then.
Dave Meltzer reported in the Wrestling Observer Newsletter that Smith hasn't been seen since his return dark match with Austin Theory because he contracted COVID.
It was said that he is doing fine now and he was backstage at the WWE Draft show in Baltimore. Harry Smith is the son of the legendary "British" Bulldog" Davey Boy Smith.
On 7/16, Smith and Austin Theory defeated Odyssey Jones and Xyon Quinn in a dark match. Smith previously wrestled for WWE a decade ago. Given his age and experience, it's likely that he will return on the main roster and not in NXT.