If I recall, TDA wire transfer goes through Wells Fargo in SF CA. Depending where your funding bank is located, let's say East Coast for example, then it all depends on who wires it in during time of day. Technically if you got it wired shortly after your bank opened, then west coast should have it credited before they close. All depends on who's receiving it on the other end weather it'll get credited that day, so for this reason funds are usually available to trade next biz day.