Unless you ordered or added a wifi adapter,no - it won't have one.  If it does, there'll be an antenna on the back of the system.

No.  Just add one of these

https://www.amazon.co.uk/802-11ac-Wireless-Network-Adapter-10-4-10-11-4/dp/B06XZ5B5G9/

Computer Model     XPS 8300
Shipping Date     1/22/2011
Country     United Kingdom

DPN    Description
8P7V4    Base,Mini Tower,Power Factor C orrection,Extreme Performance System,8300
23503    LABEL, BARCODE, TRACK, SYSTEM BOARD, GENERIC
07GHK    Module,Label,Microsoft,Desktop ,Windows Seven
30PVG    LABEL, MICROSOFT, DESKTOP, WIN7
X2JXJ    Module,Card,Graphics,M114A,STU DIO XPS
KP8GM    CARD (CIRCUIT), GRAPHICS, ADVANCED MICRO DEVICES, 1G, 5450, M114A
WH2DT    MOD,SHP MTL,SYSM,STDO,MT,EMEA
K055T    SHIPPING MATERIAL, CUSHION, MNTW, SXPS
F123T    SHIPPING MATERIAL, BOX, SYSTEM, MNTW, SXPS
2DKXV    SHIPPING MATERIAL, BOX, OPTION, KAMINO
RVW9D    Module,Thermal,Heatsink,95W,MN TW/SLTW
WDRTF    ASSEMBLY, HEATSINK, FAN, 95W, MNTW
FJ67Y    Module,Dvd+/-rw,Half Height,16 X,Inspiron,Toshiba Samsung Sto rage Technology
KMH7P    ASSEMBLY, DVD+/-RW, 16X, HALF HEIGHT, BARE, HITACHI LG DATA STORAGE
DU555    SCREW, M3X.5X5MM, HEXHEAD, PHILLIPS HEAD, THREAD FORMED, ZINC PLATED STEEL
YM4F5    Module,Media,Digital Video Dis k Drive,Resource Dvd,Extreme P erformance System,8300
M2PHF    KIT, MEDIA, DIGITAL VIDEO DISK DRIVE, RDVD, EXTREME PERFORMANCE SYSTEM, 8300
J662D    Module,Mouse,6BTN,Laser Consumer,Logitech,Desktop
J661D    KIT, MOUSE, UNIVERSAL SERIAL BUS, LASER, CONSUMER, LOGITECH
WTMCV    Module,Processor,I5-2300,2.8,4 C,SNB,D2
5TW31    PROCESSOR, I5-2300, 2.8, 4C, SNB, D2, L
MY297    LABEL, FASCIA, INTEL, CARTON
6KGF7    Module,Plug,VIDEO,JACK,High De finition Multimedia Interface, Video Graphics Adapter
NKXRW    PLUG, VIDEO, JACK, HIGH DEFINITION MULTIMEDIA INTERFACE
MW501    PLUG, VIDEO, JACK, BLACK, MSMT/MCSF
VR08H    Module,Software,Certificate Of  Authenticity,W7HP32/64
XPCG3    LABEL, CERTIFICATE OF AUTHENTICITY, OPERATING SYSTEM, W7HP3/6
WY7V7    Module,Chassis,Pwa Integrated, 460W,Power Factor Correction,8 300,White
48480    SCREW, 6-32X1/4  THREAD FORMED  ZINC PLATED STEEL  TRI-PT HX
D1P9P    ASSEMBLY, CHASSIS, L5+, 460W, 8300
02RX9    CARD (CIRCUIT), PLANAR (MOTHERBOARD), EXTREME PERF SYSTEM, 8300
DU555    SCREW, M3X.5X5MM, HEXHEAD, PHILLIPS HEAD, THREAD FORMED, ZINC PLATED STEEL
GFCTN    Module,Label,Intel,Desktop,CI5 2
KKCT0    LABEL, INTEL, DESKTOP, CI52
R355H    MOD,CORD,PWR,250V,2M,C13,UK
16583    CORD, POWER, 2 METERS, IRE/UK
G5JV2    Module,Dual In-Line Memory Mod ule,4G,2X2GB,1333
69M9V    DUAL IN-LINE MEMORY MODULE, 2G, 1333, 256X64, 8, 240, 2RX8
J6XND    Module,Software,W7HP64,Digital  Video Disk Drive,Multiple Use r Interface,NO-E
R7XD1    KIT, SOFTWARE, W7HP64, MULTIPLE USER INTERFACE, NO-E
39TXM    Module,Hard Drive,1TB,S2,#1,HI T-JUPITER
H652R    HARD DRIVE, 1TB, S2, 7.2K, SGT-PHAR
K1KDW    
KVD0J    KIT, DOCUMENTATION, ENGLAND/ENGLISH, EXTREME PERF SYSTEM, 8300, EMEA
G6FGR    
WJHNX    LABEL, REGULATORY, DESKTOP, EXTREME PERFORMANCE SYSTEM, 8300, PPRNT, EMEA
23501    LABEL, BARCODE, SYS BOX, GENERIC
JD509    LABEL, REGULATORY, SIDE, UNIVERSAL, BLANK , V2
TYHV2    
YHT95    KIT, SOFTWARE, OFCHB-2010, MPI, ENGLAND/ENGLISH, EUROPE, MIDDLE EAST & AFRICA
Y573K    
Y531K    KEYBOARD, 105, UNITED KINGDOM, KWE9C0