Yes indeed it is my friend. Looks like healthy primordia forming and growing, some pins will progress into fruiting bodies (i.e mushrooms), and others will not signified by grey heads vs the healthy light brown. Looks good so far, just make sure air/temp/humidity is proper from here and you'll be looking at healthy goombas. Also, you can always have more than one flush per mycellium colony, so don't forget that sometimes second or even third flush can be better than the first.