So people say it took up until the last minute for the launch of the SEC network but here is a timeline I found (from Wikipedia but only thing I could really find):

"AT&T U-verse was announced as the first television provider to agree to carry SEC Network. On January 13, 2014, Sports Business Journal reported that ESPN was seeking a carriage rate of $1.30 per-subscriber per month in SEC markets, and $0.25 in non-SEC markets; in comparison, Big Ten Network charges around $1 per subscriber in Big Ten markets. It was also noted that SEC Network's opening doubleheader may have been intended to put pressure on Comcast, Time Warner Cable, and Charter Communications to carry the network, as they predominantly involved teams located within their service areas.[24]

In March 2014, Dish Network reached an agreement to carry SEC Network as part of a wider carriage deal with Disney–ABC Television Group for its ABC owned-and-operated stations and cable television networks.[25][26] On April 30, 2014, Google Fiber was added as a carrier.[27] In June 2014, network head Justin Connolly expressed concern for the lack of carriage deals for SEC Network beyond those with AT&T and Dish Network, and considered the situation to be "alarming." However, he also noted that the network may successfully negotiate more carriage deals closer to its launch.[28]

On July 9, 2014, Cox Communications, whose subscriber base includes four SEC markets, reached an agreement to carry SEC Network. Exact terms were not disclosed.[29] Nine days later, ESPN also reached a deal with Comcast to carry SEC Network; in SEC markets, the provider will pay a carriage rate of $1.40 per-subscriber per month.[30] On July 25, Time Warner Cable and Bright House Networks reached deals to carry SEC Network,[31] followed by Cable One and Wide Open West on August 1.[32][33] On August 2, 2014, Suddenlink Communications announced that it had reached an agreement to carry the network on the launch date.[34] On August 4, 2014, DirecTV,[35] and C Spire Wireless both announced agreements to carry the network (the latter deal was made through the National Cable Television Cooperative, in which C Spire would provide its Fiber to the Home HDTV subscribers with access to the SEC Network App).[36] These announcements were followed by an agreement with Charter Communications on August 6, 2014. Mediacom reached an agreement to carry the network on August 14, 2014.[37][38]

With the Mediacom agreement, the two major television providers that did not reach a carriage deal prior to launch were Verizon FiOS and Cablevision.[39] However, on August 21, 2014, Sports Business Daily reported that Verizon FiOS had reached a deal to carry the network in its Texas and Florida service areas (which are within the SEC footprint). Cablevision does not have any markets within the SEC footprint.[40] NASA has arranged for the SEC Network to be made available on the International Space Station.[41]

The SEC Network is also carried by both PlayStation Vue[42] and Sling TV.[43]"

Looks like they had all the major players including Comcast wrapped up well before launch. Disappointing.