Just started saltwater tank

Hi guys!

So I am new to this whole Saltwater business... always have done freshwater but thought its time to try something new. Can someone direct me from here please

I have a 55 gallon tank
-Live sand
-Dry Rock
-Heater& Filters running
-Checked the specific gravity its at 1.027--- I know these needs to be brought done with a water change.:fish:
-Checked the water with the test strips (The 5 in 1 deal) all within normal limits

I just set this up about 3 days ago, I know it needs to cycle but what I am looking for to know when its done being cycled?

The live sand should of jump started it correct?
Thanks!