When is the marketplace coming?

It will be available when it is available. As we've mentioned in the past, there are a lot of pieces that have to come into play before the Marketplace can be made avaialble.

Have a estimated date for premium plugins feature?

You can read up about all of what is involved with that here: https://umod.org/community/announcements/5102-new-year-status-update

The information still applies; no estimated date at this time, sorry.