99% of mods need forge in order to be loaded and function. So, without forge being updated to 1.8, none of the authors can even begin to update (or estimate to update) theirs. Your question is therefore unanswerable without forge status/estimate.
Optifine is one of the exceptions since it's not technically a mod with a function but more graphics adjustment but it still requires MCP to be done which also is still work in progress like forge. The point is, none of the authors can give you estimate for their mods without these things first being updated so asking them is pointless.
Well you could keep asking if mods are out yet and we could keep answering not yet for months, OR, we could tell you about forge and MCP and you could keep an eye on those yourself and not have to ask again cause you'd know the moment they're done and authors are able to update. Guess which we'd prefer.