Blood looks dark red which says liver to me, fatal and he will bed back down and die. Figure if he took a 150 yard run before bedding down and you jumped him, it’s likely that he will do another 150 yard run and bed down again.
If you are sitting around take a look at some topo maps, he headed and bedded to an area he likes, if you can find a similar spot 150 yards in that direction he might be there if the rain gets to you. Take the time to walk back to where you shot him, walk the same 150 yards and get a general idea of what kinda trails and turns he likes to take. If you have an OnX or similar map system it can paint a good picture of where he is headed. Look to see if blood is better out of left or right side, when he gets to brush or a split in the trail which way does he prefer to turn, if brush or high grass, how high is the blood when he walks by on grass or leaves. Try to get a good pic of a few good hoof prints while you are walking to compare to others when trails split. If you know he stood in one spot, lots of blood and all four hoof prints see if you can tell which hood he leads with and spacing…. All this is to waste time but gain a lot of info if rain comes.
All and all.. waste the next hour doing this or something other than thinking about “if” he is dead or not. Calm minds make for better tracking. He is dead, just a matter of how soon you will walk up on him.