Christopher said:
"The Wounded" aired in early January 1991, "Ensign Ro" in early October 1991. A typical Trek episode took about 11 weeks from conception to airing, so "Ro" would've been conceived and written in probably late July '91, and "Wounded" in late '90.
Now, it was in either early summer of 1991 (according to
The Making of ST
S9) or late 1991 (according to
The DS9 Companion) that Brandon Tartikoff asked Rick Berman to create a third
Star Trek series. Maybe they had some preliminary discussions about the possibility in the summer but the official go-ahead wasn't until late in the year (since the series wasn't announced until after Roddenberry died in October '91).