There is nothing in Scripture that states how far in advance of the Tribulation the rapture happens.
Well, this is a new one. So you believe the church could be secretly ratured and the tribulation not happen for another month, hundred years, thousadnd years, ...?
Therefore the "signs" which you apparently seem to think might be happening may be no signs at all, and are, perhaps, inherently untrustworhy, not even worth talking about?
The Bible does not give us the timing. I doubt that it will be a long span of time. After all, with the Christians gone I think the world will be ripe for Antichrist. But what the Bible doesn't say, I can not be dogmatic about.
As to the signs, I've already answered you concerning their significance. The rapture is signless. In terms of the rapture, they have little to no bearing at all.